September does not mean the gardening season is over.

For many gardeners across the United States, it means an entirely new planting season is beginning.

Summer tomatoes and cucumbers may still be producing, but cooler nights and shorter days create opportunities for a second round of vegetables, herbs, flowers, cover crops, and plants that prefer conditions very different from July heat.

Depending on where you live, September can be the perfect time to sow:

Spinach
Lettuce
Radishes
Arugula
Kale
Bok choy
Turnips
Mustard greens
Carrots
Beets
Peas
Cilantro
Calendula
Poppies
And many more

The key is understanding that September gardening is regional.

A gardener in Minnesota may be racing an approaching frost.

A gardener in North Carolina may be entering an excellent cool-season planting window.

A gardener in Texas or Florida may finally be preparing for one of the most productive vegetable-growing periods of the year.

This guide will help you decide what to plant in September and how to make the most of the fall growing season.

Quick Answer: What Can You Plant in September?

Some of the best seeds to consider for September planting include:

Spinach
Leaf lettuce
Arugula
Radishes
Turnips
Kale
Mustard greens
Bok choy
Swiss chard
Beets
Carrots
Peas
Green onions
Cilantro
Parsley
Dill
Calendula
Bachelor buttons
Poppies
Sweet alyssum

Not all 20 belong in every September garden.

Choose according to your first fall frost, local temperature, days to maturity, and individual variety.

Why September Is an Important Planting Month

Spring gets most of the attention.

But fall gardening has several advantages.

Cooler temperatures

Many leafy greens and root vegetables grow better under moderate temperatures than extreme summer heat.

Lettuce, spinach, arugula, radishes, kale and other cool-season crops can become much easier to grow once summer begins fading.

Warm soil

Although the air is cooling, soil can remain warm from summer.

That can help seeds germinate rapidly if moisture is maintained.

Fewer summer stresses

As temperatures decline, gardeners may face less extreme heat and evaporation.

Some insect and weed pressures may also decline as the season progresses.

A second harvest

September sowing allows gardeners to use space vacated by:

Beans
Cucumbers
Early corn
Potatoes
Summer greens
Other finished crops

Instead of allowing productive soil to remain empty, plant again.

First: Find Your Average First Fall Frost

Before buying September seeds, determine your local average first fall frost date.

That date gives you a rough estimate of how much growing time remains.

Do not rely only on your USDA hardiness zone.

Your zone is useful for understanding winter cold tolerance, but two locations in the same zone can have different first-frost dates and growing seasons.

For fall vegetables, consider:

Average first frost
Current weather
Days to maturity
Frost tolerance
Day length
Your local microclimate

Then choose crops that realistically have time to produce.

Remember That Fall Growth Slows Down

A seed packet might say:

35 days to maturity.

That does not necessarily mean a crop planted September 15 will perform exactly like the same crop planted April 15.

As autumn progresses:

Days become shorter
Sun angles change
Temperatures decline
Plant growth slows

Give fall crops more time than their ideal-season maturity number might suggest.

Fast-growing varieties are especially useful for late planting.

1. Spinach

Spinach is one of the strongest September crops.

Summer heat can make spinach difficult because high temperatures encourage bolting.

Cool fall conditions are much more favorable.

Why plant spinach in September?

It is:

Cold tolerant
Compact
Useful in raised beds
Suitable for containers
Excellent for succession planting
Harvestable as baby leaves

In colder climates, plant early enough for plants to become established before severe freezes.

In milder areas, spinach can continue producing much later into fall or winter.

Planting tip

Keep the seedbed consistently moist during germination.

Late-summer soil can still be surprisingly hot and dry.

2. Leaf Lettuce

Lettuce is another excellent September vegetable.

Rather than waiting for large mature heads, grow leaf lettuce for repeated harvests.

Possible uses include:

Salads
Sandwiches
Wraps
Burgers
Baby greens

Succession sow lettuce

Plant a small amount.

Wait approximately a week or two.

Plant another small amount.

This can provide a more continuous harvest instead of producing thirty mature plants simultaneously.

In cold regions, prioritize fast-growing leaf varieties.

3. Arugula

Arugula is one of the fastest cool-season greens.

Its peppery leaves work well in:

Salads
Pizza
Sandwiches
Pasta
Mixed greens

It can be harvested young for a milder flavor.

Because it grows quickly, arugula is particularly useful when the fall growing window is becoming short.

4. Radishes

If you want one of the fastest September vegetables, grow radishes.

Many radish varieties can mature rapidly enough to fit between summer and winter.

They also require relatively little garden space.

Plant them in:

Raised beds
Containers
Garden rows
Open spaces between slower crops

Sow several small batches

Instead of planting an entire packet at once, sow small quantities every week or two while conditions remain suitable.

This prevents one enormous radish harvest.

5. Turnips

Turnips offer both edible roots and edible greens.

Young leaves can be harvested before the roots reach full size.

They prefer cool conditions and can tolerate light frost better than many warm-season vegetables.

September planting can work particularly well in regions with a sufficiently long fall.

Choose quicker-maturing varieties when frost arrives early.

6. Kale

Kale is one of the most cold-tolerant vegetables in the fall garden.

It can be harvested as:

Baby greens
Mature leaves
Cooking greens

Instead of harvesting the entire plant, pick outer leaves and allow the center to continue growing.

Kale can become particularly valuable as summer vegetables decline.

7. Mustard Greens

Mustard greens are fast-growing, flavorful and well suited to cool weather.

Their flavor ranges from mild to strongly peppery depending on variety.

Harvest young leaves for salads.

Allow plants to become larger for cooked greens.

They are particularly useful for gardeners who want a quick fall crop without waiting months for maturity.

8. Bok Choy

Bok choy is an excellent fall vegetable.

Hot weather can cause it to bolt prematurely, while cooler weather generally produces better growth.

Depending on the variety, you can harvest:

Baby bok choy
Individual leaves
Mature heads

Compact varieties make excellent raised-bed crops.

9. Swiss Chard

Swiss chard gives you both productivity and color.

Stems may be:

Red
Yellow
Pink
White
Orange

It can continue producing leaves for an extended period and tolerates cooler weather better than many summer vegetables.

Plant it in edible landscapes as well as traditional vegetable beds.

10. Beets

Beets provide two harvests.

The root is edible.

So are the greens.

That makes them an efficient fall vegetable.

Give developing roots enough space by thinning crowded seedlings.

If the season becomes too short for large roots, young beet greens can still provide a useful harvest.

11. Carrots

Carrots can be excellent fall crops when planted early enough.

The biggest challenge is germination.

Carrot seeds are small and planted shallowly, which means the seedbed can dry rapidly during late-summer heat.

Keep carrot rows moist

Do not allow the surface to repeatedly dry while seeds are germinating.

Once established, carrots become easier to manage.

Choose faster or shorter varieties if your remaining season is limited.

12. Peas

Peas prefer cool weather.

In regions with enough fall growing time, September can provide an opportunity for a second pea crop.

Use:

Trellises
Netting
Fences
Other vertical supports

Give peas support early rather than trying to untangle mature vines later.

In northern regions with an early first frost, September may be too late for many pea varieties.

Check days to maturity before planting.

13. Green Onions

Green onions or scallions are efficient crops for small spaces.

They grow vertically rather than spreading widely.

Plant them in:

Raised beds
Containers
Herb gardens
Vegetable beds

Even when the remaining season is too short for large bulb onions, green onions may still produce a useful harvest.

14. Cilantro

Gardeners frustrated by cilantro during summer should try it again in fall.

Cilantro often bolts rapidly during hot weather.

Cooler conditions can extend the useful leaf-harvest period.

Use fresh cilantro in:

Salsa
Tacos
Curries
Soups
Salads
Asian dishes

Succession sowing is useful because cilantro naturally moves through its life cycle relatively quickly.

15. Parsley

Parsley tolerates cool conditions and can remain productive well into fall.

It germinates more slowly than radishes or arugula, so September sowing works best where the season remains relatively long.

In colder climates, established parsley plants may be more useful than starting very late seed.

16. Dill

Dill can be direct sown for fall production in suitable climates.

It prefers cooler weather compared with extreme midsummer heat.

Because dill develops a taproot, direct sowing is usually easier than repeatedly transplanting established plants.

Grow it for:

Fresh leaves
Pickling
Seeds
Pollinator flowers

17. Calendula

September is not only about vegetables.

Calendula can thrive during cool weather in many regions.

Its orange and yellow flowers add color when summer annuals begin fading.

In mild climates, fall-sown calendula may produce flowers over an extended cool season.

In colder climates, planting timing and winter survival depend heavily on local conditions.

18. Bachelor Buttons

Bachelor buttons—also called cornflowers—are classic cottage-garden flowers.

In suitable climates, fall sowing can help produce strong spring plants.

They are available in:

Blue
Pink
White
Purple
Mixed colors

Check your local climate before fall planting.

Gardeners in extremely cold regions may prefer spring or dormant-sowing methods instead.

19. Poppies

Certain poppies respond well to fall or cool-season sowing.

Their seeds are tiny and generally should not be buried deeply.

Many poppies dislike root disturbance, making direct sowing a practical method.

Because requirements differ by species, always identify the exact poppy before planting.

20. Sweet Alyssum

Sweet alyssum is a low-growing flower useful for:

Garden edges
Raised beds
Pollinator plantings
Containers
Path borders

It performs well in cooler conditions and can complement fall vegetables.

Its small flowers can soften the appearance of vegetable beds while adding another flowering resource to the garden.

What to Plant in September in Northern States

Gardeners in northern states have the shortest window.

Focus on very fast and cold-tolerant crops.

Potential choices include:

Spinach
Radishes
Leaf lettuce
Arugula
Mustard greens
Baby kale
Fast turnips

The farther north you are, the more important crop maturity becomes.

September may also become a period for:

Cover crops
Soil preparation
Seed saving
Fall-planted perennials
Preparing beds for winter

Do not force a 90-day vegetable into a four-week growing window.

What to Plant in the Midwest and Northeast

Depending on first-frost timing, gardeners may still plant:

Spinach
Leaf lettuce
Radishes
Arugula
Turnips
Mustard greens
Kale
Cilantro

Use frost protection to extend the season.

A simple row cover can sometimes make the difference between losing a crop during one cold night and harvesting for several additional weeks.

What to Plant in the Mid-Atlantic

The longer fall allows more options.

Consider:

Lettuce
Spinach
Radishes
Kale
Bok choy
Mustard
Turnips
Beets
Carrots
Cilantro
Peas

Later plantings should increasingly emphasize faster varieties.

What to Plant in the Southeast

For many Southeastern gardeners, September can be the beginning of an important cool-season vegetable cycle.

As extreme summer heat begins easing, gardeners can transition toward crops such as:

Broccoli
Cabbage
Kale
Lettuce
Spinach
Mustard greens
Bok choy
Radishes
Carrots
Beets
Turnips
Cilantro

Some longer-maturing crops may be better started from transplants rather than seed when the calendar is already advanced.

What to Plant in Texas and the Southern Plains

Texas contains several very different climates.

North Texas, Central Texas and the Gulf Coast should not automatically use the same date.

September may open opportunities for cool-season vegetables as temperatures become more manageable.

Potential crops include:

Radishes
Lettuce
Greens
Kale
Mustard
Carrots
Beets
Turnips
Cilantro

In the hottest areas, soil temperatures may still be excessive early in the month.

Use shade, moisture management, and appropriate planting dates.

What to Plant in California

California has tremendous climate variation.

Coastal gardeners, Central Valley gardeners, mountain gardeners and Southern California gardeners need different schedules.

In suitable regions, September planting may include:

Beets
Bok choy
Spinach
Lettuce
Peas
Radishes
Carrots
Swiss chard
Parsley
Cilantro

Fall can also be useful for establishing certain flowers and perennials.

Always use county-level guidance whenever possible.

What to Plant in the Pacific Northwest

September can be an important period for:

Spinach
Lettuce
Arugula
Radishes
Hardy greens
Selected overwintering crops
Cover crops

The challenge increasingly becomes decreasing daylight rather than extreme cold alone.

Plant quickly.

Every week matters.

What to Plant in the Desert Southwest

Gardeners in extremely hot summer climates often experience a very different seasonal pattern.

September may finally bring conditions suitable for beginning fall food production.

Depending on elevation and local temperatures, consider:

Carrots
Beets
Radishes
Lettuce
Spinach
Cilantro
Kale
Other cool-season greens

If daytime temperatures remain extremely high, wait or provide temporary shade during germination.

September Seed-Starting Challenge: Hot Soil

One of the hardest things about a fall garden is that you are trying to establish cool-season plants while summer may still be present.

Seeds require consistent moisture.

Tiny seedlings have shallow roots.

A seedbed can dry in hours under hot September sun.

Use several strategies.

Plant in the evening

This gives seeds a cooler first night before the next day’s heat.

Water before planting

Begin with evenly moist soil.

Water gently afterward

Do not blast tiny seeds out of their rows.

Use temporary shade

Shade cloth can help moderate extreme conditions during establishment.

Check moisture frequently

Do not follow a once-a-week watering routine during germination.

Look at the soil.

Use Succession Planting

September is perfect for succession sowing.

Instead of planting fifty radishes today, plant ten.

Plant another ten next week.

Then another group.

Do the same with:

Lettuce
Arugula
Spinach
Cilantro
Mustard greens

As long as your remaining season allows it, succession sowing creates a continuous harvest.

Use Every Empty Space

Look at your summer garden.

Where are there gaps?

Perhaps:

The beans finished.

One cucumber vine died.

The potatoes were harvested.

Early corn is gone.

Lettuce bolted months ago.

Do not wait until the entire garden is empty.

Plant fall crops into available spaces immediately.

This is sometimes called relay planting.

One crop begins while another is finishing.

Grow Fast Crops Between Slow Crops

Radishes, arugula and baby lettuce can mature while slower plants are still developing.

Plant them between appropriately spaced:

Kale
Broccoli
Cabbage
Other long-season crops

Harvest the fast crop before the larger plants require the space.

That turns empty early-season soil into productive growing area.

Protect Crops From Early Frost

An early frost does not always need to end the fall garden.

Many cool-season vegetables tolerate some cold.

Additional protection can help.

Options include:

Floating row covers
Low tunnels
Cold frames
Cloches

A small amount of protection can sometimes extend harvest considerably.

Do not use plastic directly against tender foliage during freezing conditions.

What NOT to Plant in September

For much of the United States, September is too late to begin long-season warm-weather crops from seed.

These commonly include:

Tomatoes
Peppers
Eggplants
Watermelons
Muskmelons
Sweet corn
Pumpkins
Long-season squash

Exceptions exist in frost-free and subtropical climates.

But for most gardeners, September is the time to switch from summer crops toward cool-season vegetables.

Do not waste seeds fighting the calendar.

Think Beyond This Fall

Some September planting is done for next year.

Depending on climate and species, gardeners may use fall for:

Perennial flowers
Native plants
Wildflowers
Spring-flowering plants
Overwintering vegetables
Cover crops

A fall garden does not need to produce every harvest before December.

Some of what you plant now is an investment in spring.

Why September Is a Great Time to Buy Seeds

Spring is not the only seed-shopping season.

September gardeners need varieties selected for:

Fast maturity
Cold tolerance
Fall production
Overwintering
Succession planting
Spring establishment

Buying seeds now also allows you to begin preparing for:

Winter sowing
Indoor seed starting
Next year’s vegetable garden
Pollinator projects
Cottage gardens
Food forests

Good gardens are rarely planned one week before planting.

Build a September Seed Collection

A practical fall collection could include four groups.

Fast vegetables

Radishes
Arugula
Leaf lettuce

Cold-tolerant vegetables

Spinach
Kale
Mustard
Turnips

Herbs

Cilantro
Parsley
Dill

Flowers

Calendula
Bachelor buttons
Poppies
Alyssum

Then choose varieties according to your local season.

Why Choose Urban Garden Seed?

Urban Garden Seed offers vegetable, herb, flower, fruit, tree, plant, and specialty seeds for gardeners across the United States.

September is an excellent time to explore seeds differently.

Instead of shopping only for tomatoes and cucumbers, build a fall collection around:

Leafy greens
Root vegetables
Cool-season herbs
Cold-tolerant flowers
Plants for next spring

Urban Garden Seed focuses on Non-GMO, untreated seeds and offers a 30-Day Satisfaction Guarantee.

Always review the growing requirements and days to maturity of the individual variety before planting.

Summer Is Ending. Your Garden Doesn’t Have To.

September can feel like the end of the gardening season.

It is not.

Pull the finished bean plants.

Harvest the last cucumber.

Clear one small section.

Rake the soil.

Choose something fast.

Plant another seed.

A few weeks later, you may be harvesting fresh radishes, lettuce, arugula or spinach while summer gardens around you are already empty.

That is the advantage of thinking beyond spring.

A productive garden does not have only one planting season.

It changes with the weather.

And September can be one of its most rewarding chapters.

Ready to Plant Your September Garden?

Explore vegetable, herb, flower and specialty seeds at UrbanGardenSeed.com and choose varieties for your fall garden.

Plant fast-growing crops.

Use your local frost date.

Protect seedlings from late-summer heat.

Keep sowing while the season allows.

Summer harvests may be ending. Your next garden can start now.

Frequently Asked Questions

What vegetables can I plant in September?

Depending on region, September planting can include spinach, lettuce, radishes, arugula, kale, mustard greens, turnips, bok choy, beets, carrots, peas and other cool-season vegetables.

Is September too late to plant vegetables?

Not necessarily. In northern climates, focus on very fast crops. In southern climates, September may mark the beginning of the main cool-season vegetable-growing period.

What is the fastest vegetable to plant in September?

Radishes and baby greens such as arugula and leaf lettuce are among the quickest options.

Can I plant lettuce in September?

Yes, in many regions. Lettuce prefers cooler conditions and can be an excellent fall crop.

Can I plant spinach in September?

Yes. Spinach is highly suited to cool weather and is one of the strongest fall vegetables in many climates.

Can carrots be planted in September?

Yes where enough growing season remains. In colder locations, September may be too late for full-sized carrots, so choose faster varieties or plant earlier.

Can I plant kale in September?

Yes in many regions. Kale tolerates cold conditions better than most warm-season vegetables.

Can I plant radishes in September?

Yes. Radishes are particularly useful because many varieties mature quickly.

Can I plant peas in September?

It depends on the region and days until frost. Areas with a long fall may have sufficient time for peas; colder northern gardens may not.

What herbs can I plant in September?

Cilantro, parsley and dill may be suitable depending on local temperatures and remaining growing season.

What flowers can I plant in September?

Calendula, bachelor buttons, certain poppies, sweet alyssum and regionally appropriate perennials may be suitable depending on climate and species.

Should I use my USDA zone to decide what to plant?

Use it as context, but your local first frost date, weather and individual crop requirements are more useful for fall vegetable timing.

How do I germinate fall seeds when September is still hot?

Maintain consistent soil moisture, consider temporary shade during extreme heat, and sow during cooler parts of the day.

What should I do if frost comes early?

Cold-tolerant vegetables may survive light frost, and row covers, low tunnels, cloches or cold frames can provide additional protection.

Where can I buy seeds for a September garden?

Visit UrbanGardenSeed.com to explore vegetable, herb, flower and specialty seeds for fall and future growing seasons.