Plant tomatoes after your last spring frost, when soil reaches 60°F
The single most important rule for tomato timing is this: soil temperature matters more than calendar date. Tomato seeds and seedlings will sit dormant or rot in cold soil. Once soil reaches 60°F, seeds can germinate. Once it reaches 65°F to 70°F, seedlings thrive and grow quickly. Plant too early and you waste weeks waiting for growth that never comes.
Your last spring frost date is the anchor point. Find yours by searching "[your city] last frost date" — the National Weather Service publishes these for every county in the United States. Count backward from that date: if your last frost is May 15, you can plant seedlings outdoors around May 15 to May 20. If you are starting from seed indoors, begin 6 to 8 weeks before that date, so around late March or early April in most regions.
Soil temperature trumps air temperature. A sunny day in April might feel warm, but soil 4 inches down can still be 45°F. Use a soil thermometer — they cost $8 to $15 — or wait until nighttime temperatures stay above 50°F for a full week. That is a safer sign that soil has warmed enough.
Key Takeaways
- Plant tomato seedlings outdoors after your last spring frost date, when soil temperature reaches 60°F or higher.
- Start seeds indoors 6 to 8 weeks before your last frost date if you want to grow from seed rather than buying seedlings.
- Determinate (bush) tomatoes mature in 50 to 70 days; indeterminate (vining) tomatoes produce fruit for months until frost kills them.
- Harvest tomatoes when they reach full color but are still slightly firm, or pick them green and ripen them indoors if frost is coming.
- In hot climates above 85°F, tomatoes stop setting fruit, so plant early enough to produce before peak summer heat arrives.
Timing varies by tomato type: bush versus vining
Determinate tomatoes (bush varieties) grow to a fixed size, flower all at once, and produce most of their fruit in a 3- to 4-week window. They mature in 50 to 70 days. These are ideal if you want to can or freeze a large batch at once, or if you have limited space. Plant them all on the same day for a synchronized harvest.
Indeterminate tomatoes (vining varieties) grow continuously, flower throughout the season, and produce fruit until frost kills the plant. They take 70 to 85 days to first fruit, but then keep producing for months. These are better if you want fresh tomatoes on your table all summer and fall. They need staking or caging and regular pruning.
The variety name on the seed packet or seedling label tells you which type. Look for the word "determinate" or "indeterminate," or search the variety name online. If you see "days to maturity: 65 days," that is the time from planting to first ripe fruit, not the end of production.
Heat stops tomato flowering — plant early in hot climates
Tomatoes need warmth to grow, but they have a limit. Once daytime temperatures exceed 85°F to 90°F consistently, tomato flowers drop without setting fruit. This is not a disease; it is biology. Pollen becomes sterile in extreme heat, so no fruit develops even though the plant looks healthy.
If you live where summer regularly hits 90°F or higher by June, plant early. Aim to have your tomatoes flowering and setting fruit before the heat peak arrives. In Phoenix, Austin, or southern California, that means planting in late February or early March so fruit develops in April and May. You can then plant a second crop in late summer (July or August) for a fall harvest after temperatures drop.
In mild climates where summer peaks around 75°F to 80°F, you have more flexibility. Plant anytime after your last frost and you will get steady production all season.
Harvest timing: color, firmness, and frost important date
Tomatoes are ready to pick when they reach full color for their variety — red, orange, yellow, or purple depending on the type — and yield slightly to thumb pressure. They do not need to be soft; a little firmness means they will travel and store better. Pick them at this stage and they will continue ripening on the counter for several days.
If frost is forecast and you still have green tomatoes on the vine, pick them all. Tomatoes ripen indoors at room temperature (65°F to 75°F) even after they are separated from the plant. Place them in a paper bag with a ripe banana or apple — the ethylene gas speeds ripening — and check them daily. They will turn color within a week or two, though they may not develop quite the same flavor as vine-ripened fruit.
Do not refrigerate tomatoes until they are fully ripe. Cold below 55°F stops the ripening process and damages the flavor. Once ripe, you can refrigerate them for a few days, but bring them back to room temperature before eating for best taste.
Regional planting windows at a glance
| Region | Last Frost Date (Approximate) | Seedling Planting Window | Seed Starting Indoors |
|---|---|---|---|
| Upper Midwest / Northern Northeast | May 15 to June 1 | Late May to early June | Late March to mid-April |
| Mid-Atlantic / Lower Midwest | April 15 to May 15 | Mid-May to late May | Early March to early April |
| South / Lower Southeast | March 15 to April 15 | Early April to mid-April | January to mid-February |
| Southwest (hot climates) | February 15 to March 15 | Late February to mid-March | December to January |
| Pacific Northwest | April 15 to May 15 | Mid-May to late May | Early March to early April |
These dates are starting points. Check your specific county's frost date online — it can vary by 2 to 3 weeks within a state depending on elevation and proximity to water. A local garden center or cooperative extension office can also confirm the best planting window for your exact location.
What to do if you miss the spring window
If you did not plant in spring, you still have options depending on where you live. In the South and Southwest, you can plant a second crop in mid-summer (July or August) for a fall harvest. Temperatures are dropping by then, and plants will produce through October or November before frost arrives.
In northern regions with short growing seasons, a second planting rarely produces fruit before frost. If you missed spring, wait until next year. Tomatoes are annual plants — they complete their life cycle in one season — so there is no benefit to planting in July in Minnesota or Maine.
If you are growing in containers, you have slightly more flexibility. You can move pots to a sunny spot as soon as soil warms, even if outdoor beds are still cold. Container soil warms faster than ground soil because it is exposed to air on all sides.
Frequently Asked Questions
Can I plant tomatoes before the last frost date if I use row covers?
Row covers protect seedlings from frost damage, but they do not warm the soil. If soil is still below 60°F, the plant will not grow even if the air above it is warm. Wait for soil temperature to reach 60°F, then use row covers if a late frost is still possible. This gives you both warm soil and frost protection.
How long does it take from planting to first ripe tomato?
From transplanting a seedling outdoors to picking a ripe tomato is typically 50 to 85 days, depending on variety. Determinate types are faster (50 to 70 days). Indeterminate types take longer to first fruit (70 to 85 days) but then produce continuously. Starting from seed indoors adds 6 to 8 weeks before you even transplant outdoors.
What if my area has a short growing season?
Choose early-maturing varieties labeled "50 to 60 days to maturity" rather than 80-day types. Start seeds indoors as soon as possible after winter (late January or February). Use black plastic mulch or row covers to warm the soil faster. Indeterminate varieties may not finish producing before frost, so determinate types are often a better choice in short seasons.
Can I grow tomatoes year-round indoors?
Tomatoes need 6 to 8 hours of direct sunlight daily. Indoors under standard lights, they grow slowly and produce little fruit. Grow lights designed for plants (not regular bulbs) can work, but the setup is expensive and energy-intensive. Most home gardeners grow tomatoes outdoors in season and do not attempt winter indoor production.