Plant tomatoes in Alabama between mid-March and early April for spring harvest, or in late July and August for fall harvest

Alabama's warm climate allows two distinct tomato-growing windows each year. The spring window runs from mid-March through early April, after the last frost date passes. The fall window opens in late July and runs through August, giving you a second chance to grow tomatoes before the first frost arrives in November. Which window you choose depends on your location within the state — northern Alabama freezes earlier than the coast — and whether you prefer the larger spring harvest or the smaller but often disease-free fall crop.

Tomatoes need soil that has warmed to at least 60 degrees Fahrenheit, ideally 65 to 70 degrees. Planting too early, even after the last frost date, means the seeds will sit in cold soil and rot rather than sprout. Waiting until the soil is genuinely warm produces faster germination and stronger seedlings.

Key Takeaways

  • Northern Alabama's last frost date falls around April 15, while southern Alabama's is closer to March 15, so check your specific county rather than using a statewide date.
  • Soil temperature matters more than air temperature — wait until soil reaches 60 to 70 degrees Fahrenheit before planting seeds or transplants.
  • A fall crop planted in late July or early August can produce tomatoes through October before the first frost, often with fewer disease problems than spring plants.
  • Transplants (seedlings started indoors) can go in the ground 1 to 2 weeks before direct-seeded tomatoes, since they are already established.

Last Frost Dates by Alabama Region

Alabama spans a wide range of elevations and latitudes, which means frost dates vary significantly across the state. Northern Alabama, including areas around Huntsville and Birmingham, experiences its last frost around April 10 to April 20. Central Alabama, including Montgomery, sees the last frost around April 1 to April 10. Southern Alabama and coastal areas near Mobile have the earliest last frost date, typically March 15 to March 25.

These dates are historical averages — they represent the point when frost is unlikely but not impossible. A late freeze can still occur after these dates, though it becomes less common. If you plant tomatoes right on your last frost date and a freeze arrives a week later, young plants can be killed. Many gardeners in Alabama wait an additional week or two past the official last frost date to reduce this risk.

To find your exact last frost date, search your county name plus "last frost date" or visit the National Weather Service office for your region. County Extension offices in Alabama also publish frost date maps specific to your area.

Spring Planting: March Through April

Spring is Alabama's main tomato season. Most gardeners plant between mid-March and early April, depending on location. This timing gives tomatoes a long, warm growing season through summer, when they produce the heaviest yields. Spring-planted tomatoes typically begin flowering in May and June and produce ripe fruit from June through August.

If you are starting from seed indoors, begin 6 to 8 weeks before your intended outdoor planting date. For northern Alabama (April 15 last frost), start seeds indoors around mid-February. For southern Alabama (March 15 last frost), start seeds around early January. Seedlings should be 6 to 8 inches tall and have their first true leaves before transplanting outdoors.

Hardening off — gradually exposing seedlings to outdoor conditions over 7 to 10 days — is essential before planting. Seedlings grown indoors are tender and will wilt or die if moved directly into full sun and wind. Place them in a sheltered spot with dappled light for a few days, then gradually increase sun exposure before planting in the garden.

Fall Planting: Late July Through August

A fall crop is often overlooked but produces excellent results in Alabama. Plant tomato transplants in late July or early August, giving them 8 to 10 weeks to mature before the first frost. Fall tomatoes typically produce fruit from September through October and sometimes into early November, depending on your location.

Fall crops often have fewer disease and pest problems than spring crops because the cooler, drier weather of late summer and fall discourages fungal diseases like early blight and septoria leaf spot. However, fall tomatoes produce smaller yields than spring plants because they have less time to grow and fruit before frost arrives.

For a fall crop, you must use transplants rather than seeds — there is not enough time for seeds to germinate, grow, and produce fruit before frost. Buy transplants from a nursery in late July or early August, or start seeds indoors in late May or early June if you want to grow your own. Plant them as soon as they are ready, because every week of delay cuts into your harvest window.

Soil Temperature and Readiness

Soil temperature is more important than air temperature for tomato success. Even if daytime air temperatures reach 70 degrees Fahrenheit, cold soil will cause seeds to rot and transplants to sit dormant and sulk. Use a soil thermometer to check the temperature 4 inches deep in your garden bed. Wait until soil reaches at least 60 degrees, ideally 65 to 70 degrees, before planting.

In Alabama, spring soil typically reaches 60 degrees in late March in the south and mid-April in the north. Fall soil cools more slowly — it may not drop below 70 degrees until late August or early September, which is why late July and August planting works well for fall crops.

If you are eager to plant and soil is still cool, use black plastic mulch or landscape fabric to warm the soil for 2 to 3 weeks before planting. This technique can advance your planting date by 1 to 2 weeks in spring.

Transplants Versus Direct Seeding

Most Alabama gardeners plant tomato transplants (seedlings) rather than seeds directly in the garden. Transplants are faster — they produce fruit 2 to 3 weeks earlier than direct-seeded plants — and they are easier to manage in a home garden. You can plant transplants 1 to 2 weeks before soil is warm enough for seeds, because the seedlings are already established and can handle slightly cooler conditions.

Direct seeding is cheaper if you are planting a large area, but it requires patience. Seeds need consistently warm soil and take 7 to 10 days to germinate. In Alabama's spring, this often means waiting until late April or early May, which shortens the growing season. Direct seeding works better for fall crops if you have the space and time, since fall soil stays warm longer.

If you choose transplants, harden them off for 7 to 10 days before planting. If you direct seed, plant seeds 1/4 inch deep and keep the soil consistently moist until seedlings emerge. Thin seedlings to 18 to 24 inches apart once they have their first true leaves.

Protecting Young Plants from Late Frost

Even after the last frost date, a surprise freeze can occur. Young tomato plants are killed by frost, so have a plan to protect them if temperatures drop below 32 degrees Fahrenheit. Row covers, frost cloth, or even old blankets draped over plants can provide several degrees of protection. Remove covers during the day so plants get sun and air circulation.

If you plant right on your last frost date, monitor the 10-day forecast for the first two weeks after planting. If frost is predicted, cover plants the evening before and uncover them the next morning. This extra step takes 10 minutes and can save your entire crop.

Another strategy is to plant in stages — put out half your transplants 1 to 2 weeks before the last frost date, then plant the rest a week or two later. If the first planting is killed by frost, the second planting survives and you still have a crop.

Frequently Asked Questions

Can I plant tomatoes in February in Alabama?

Not outdoors. Soil is too cold in February across all of Alabama, and frost will kill young plants. You can start seeds indoors in February for transplants to move outside in March or April, but outdoor planting must wait until soil warms.

What is the difference between the last frost date and when I should plant?

The last frost date is when frost becomes unlikely, but it can still happen. Many gardeners wait 1 to 2 weeks past the last frost date to reduce risk. More importantly, soil temperature matters more than the calendar — wait until soil reaches 60 to 70 degrees, which usually occurs a week or two after the last frost date.

Is a fall tomato crop worth the effort in Alabama?

Yes, if you have space. Fall crops produce smaller yields but often have fewer disease problems and can produce fruit into October or November. They are also a good way to use garden space that would otherwise sit empty after spring crops finish in August.

How do I know when soil is warm enough?

Use a soil thermometer, available at any garden center for under $10. Push it 4 inches into the soil in the morning and read it after 5 minutes. Repeat on several days to get an average. When soil consistently reads 60 to 70 degrees, it is ready for tomatoes.

Can I plant tomatoes in June in Alabama?

Not for a spring crop — it is too late. June-planted tomatoes will not have time to produce much fruit before heat stress slows flowering in July and August. If you want a summer crop, plant in late July or August for a fall harvest instead.