Plant tomatoes in Arkansas after the last spring frost, which falls between mid-April and early May depending on your location

Arkansas has two planting windows for tomatoes. The main spring planting happens after your area's last frost date passes—typically mid-April in southern Arkansas and early May in the north. Tomatoes need soil that has warmed to at least 60°F, ideally 65°F or higher, so waiting until soil temperature rises matters more than the calendar date alone. You can also plant a second crop in late July or early August for a fall harvest before the first frost arrives in October or November.

The difference between your county and a neighboring one can be two weeks or more. Check your specific frost dates through the University of Arkansas Division of Agriculture's frost date map, which breaks the state into zones. Planting too early into cold soil causes seeds to rot and transplants to sit dormant and stressed, inviting disease. Planting too late compresses your growing season and reduces yield before fall frost arrives.

Key Takeaways

  • Spring planting in Arkansas happens after the last frost date, which ranges from mid-April in the south to early May in the north.
  • Soil temperature matters as much as air temperature—wait until soil reaches 60°F to 65°F before planting seeds or transplants.
  • A second planting in late July or early August produces a fall crop that matures before the first frost in October or November.
  • The University of Arkansas Division of Agriculture provides a county-by-county frost date map to pinpoint your exact planting window.
  • Starting seeds indoors six to eight weeks before your last frost date gives you transplants ready to go into the ground at the right time.

Spring Planting: The Main Tomato Season

Most Arkansas gardeners plant tomatoes in spring, aiming for transplants to go in the ground two to three weeks after the last frost date. This timing lets soil warm fully and reduces the risk of late cold snaps killing young plants. In central Arkansas around Little Rock, this typically means late April. In the northern Ozark region, wait until early May. In the southern Delta, you may plant as early as mid-April.

If you are starting from seed indoors, count backward six to eight weeks from your target transplant date. For example, if your last frost date is May 1, start seeds indoors around mid-March. Keep seedlings under grow lights or in a sunny window, and harden them off—gradually expose them to outdoor conditions—for seven to ten days before planting outside. This prevents transplant shock and gives seedlings time to adjust to wind, direct sun, and temperature swings.

Direct seeding tomatoes into the garden (planting seeds straight in the soil) is less common in Arkansas because the spring window is short and seeds need consistent warmth. Transplants are the faster, more reliable route for most home gardeners.

Fall Planting for a Second Harvest

Arkansas's long, warm growing season makes a fall tomato crop possible. Plant transplants in late July or early August so they mature before the first frost. The first frost in Arkansas typically arrives between mid-October in the north and late October or early November in the south, giving you a window of 60 to 90 days to grow and harvest.

Fall-planted tomatoes often produce better fruit quality than spring plants because they avoid the intense summer heat and humidity that can cause blossom-end rot and cracking. However, you must use transplants, not seeds, because there is no time for seeds to germinate and grow into productive plants. Buy transplants from a nursery in July, or start seeds indoors in May or early June if you want to grow your own fall transplants.

Fall tomatoes also face fewer pest and disease pressures than spring crops, since many insects and fungal problems peak during summer heat. Water consistently as temperatures cool in September and October, since plants still need moisture even as growth slows.

Soil Temperature and Hardening Off Transplants

Soil temperature is the real trigger for planting, not just the calendar. Tomatoes planted into cold soil sit dormant, their roots do not grow, and they become targets for soil-borne diseases like damping-off and root rot. A soil thermometer costs five to ten dollars and takes the guesswork out of timing. Push it into the soil where you plan to plant, wait five minutes, and read the temperature. Once it reaches 60°F consistently, you can plant.

Hardening off transplants prevents wilting and sunscald when they move from the protected indoor environment to the garden. Start the process seven to ten days before planting. Place seedlings outside in a shaded, sheltered spot for two to three hours on the first day. Each day, increase sun exposure and time outdoors by an hour or two. By day seven or eight, they should handle full sun and outdoor conditions for the whole day. On the final day or two before planting, leave them out overnight if temperatures stay above 50°F.

Protecting Young Plants from Late Frost

Even after the official last frost date, a surprise cold snap can damage or kill young tomato plants. Temperatures below 50°F slow growth and stress plants; frost below 32°F kills them outright. Keep frost cloth, row covers, or old blankets on hand during the first two to three weeks after planting. If frost is forecast, drape covers over plants in the evening and remove them the next morning once temperatures rise above 50°F.

Watering plants the day before a frost also helps—moist soil holds heat better than dry soil. Avoid fertilizing young transplants right after planting; wait two to three weeks until they are established. Nitrogen-heavy fertilizer pushes leafy growth at the expense of root development, making plants more vulnerable to stress.

Variety Selection for Arkansas's Growing Season

Choose tomato varieties based on your planting date and how much time they need to mature. Determinate varieties (bush types) mature faster, typically 60 to 75 days from transplant to first fruit, making them ideal for fall planting. Indeterminate varieties (vining types) keep producing all season and need 75 to 85 days or more, so they work best for spring planting where you have three to four months before frost.

Heat-tolerant varieties like 'Heatwave II', 'Phoenix', and 'Surefire' handle Arkansas's hot, humid summers better than cool-season types. For fall planting, any variety works, but faster-maturing types like 'Early Girl' or 'Stupice' are safer bets because they finish before frost arrives. Check the seed packet or nursery label for days to maturity and choose accordingly.

Spacing, Depth, and Planting Depth Matter

Plant transplants deep—bury the stem up to the first true leaves. Tomatoes develop roots all along the buried stem, creating a stronger root system that anchors the plant and absorbs water and nutrients more efficiently. Space plants 24 to 36 inches apart, depending on the variety. Determinate bush types can be closer; indeterminate vining types need more room for air circulation, which reduces fungal disease in Arkansas's humid climate.

Dig a hole slightly larger than the transplant's root ball, set the plant in at the deeper depth, and backfill with soil. Water when ready and deeply to settle soil around the roots and eliminate air pockets. Mulch around the base with 2 to 3 inches of straw or wood chips, keeping mulch a few inches away from the stem to prevent rot and pest damage.

Frequently Asked Questions

What is the last frost date for my county in Arkansas?

Last frost dates vary by county and elevation. The University of Arkansas Division of Agriculture publishes a frost date map online showing dates for each region. Southern Arkansas counties like Union and Ouachita have dates around April 15; northern counties like Benton and Carroll are closer to May 10. Look up your specific county for the most accurate date.

Can I plant tomatoes in March in Arkansas?

Planting transplants in March is risky because soil is usually too cold and frost is still likely. Soil temperature is typically below 60°F in early March across most of Arkansas. Seeds will rot, and transplants will sit stunted and stressed. Wait until mid-April or later when soil has warmed.

How do I know if my soil is warm enough?

Use a soil thermometer inserted 4 inches deep in the morning. Tomatoes need soil at least 60°F, ideally 65°F or warmer. Check the temperature for three to five days in a row to confirm it is consistently warm, not just warm on one sunny day.

Is it too late to plant tomatoes in June?

June is too late for spring planting in Arkansas because transplants will not have enough time to produce fruit before summer heat peaks and stress increases disease risk. Wait and plant a fall crop in late July or early August instead, which gives you a better harvest window.

Do I need to start seeds indoors, or can I buy transplants?

Buying transplants from a nursery is simpler and works well for most home gardeners. Starting seeds indoors gives you more variety choices and costs less if you are planting many plants. Either method works; choose based on your time, space, and budget.