Tomatoes grow on a timeline that starts with planting and ends 60 to 85 days later, depending on the variety and your climate
Most tomato plants produce fruit between mid-summer and the first frost, but the exact timing depends on when you plant and how warm your region stays. If you plant seedlings outdoors after the last spring frost, you will see flowers in 4 to 6 weeks and ripe fruit 20 to 30 days after that. The whole cycle—from transplanting a young plant to picking a red tomato—usually takes 2 to 3 months.
The speed varies by variety. Cherry tomatoes and early varieties like 'Early Girl' fruit faster (around 60 days from transplant). Large slicing tomatoes like 'Brandywine' take longer (80 to 85 days or more). Starting from seed indoors adds 6 to 8 weeks before you even move plants outside, so seed-to-harvest can stretch to 4 or 5 months total.
Key Takeaways
- Tomatoes need warm soil and air—they will not grow or flower if temperatures stay below 55°F, and they slow down significantly below 70°F.
- Most varieties flower 4 to 6 weeks after transplanting outdoors, then produce ripe fruit 20 to 30 days after flowers appear.
- Cherry and early varieties fruit in 60 to 70 days; large slicing types take 80 to 90 days or longer.
- Growth stops when nighttime temperatures drop below 55°F, so harvest all remaining fruit before the first frost in your area.
How temperature controls when tomatoes grow
Tomatoes are warm-season plants and will not move into the growth stage until soil and air warm up. Soil below 55°F stops root activity almost entirely. Between 55°F and 70°F, roots and stems grow slowly. Once nighttime temperatures stay above 60°F and daytime highs reach 70°F or higher, growth accelerates.
Flowering—the step that leads to fruit—requires even warmer conditions. Tomato pollen does not set fruit reliably below 55°F at night or above 90°F during the day. If your region has cool springs or early fall frosts, you will see a shorter window when flowers actually turn into tomatoes. This is why gardeners in short-season climates choose early varieties and start seeds indoors weeks before the last frost date.
The growth stages and what to expect at each one
Weeks 1 to 3 after transplanting: The plant establishes roots and grows leaves. You will not see flowers yet. The plant is building the structure it needs to support fruit later.
Weeks 4 to 6: Flower buds form in the leaf axils (where leaves meet the stem). Flowers open and bloom. This is when pollination happens—wind, bees, or your hand shaking the plant transfers pollen between flowers.
Weeks 7 to 9: Flowers that were pollinated swell into small green tomatoes. Unpollinated flowers drop off. The fruit grows larger each week, fed by the plant's leaves and roots.
Weeks 10 to 12 and beyond: Green tomatoes begin to change color—first a pale yellow or orange spot appears, then the whole fruit ripens to red (or yellow, orange, pink, or purple depending on variety). Ripe fruit is ready to pick.
When to plant so tomatoes ripen before frost
The key is knowing your first fall frost date—the average date when temperatures drop to 32°F in your area. You can find this through your local cooperative extension office or by searching "[your city] first frost date." Count backward 85 days (or 60 days for early varieties) from that date. That is roughly when you should transplant seedlings outdoors.
If you start from seed indoors, add another 6 to 8 weeks to that calculation. For example, if your first frost is October 15, and you want to grow a large slicing tomato (85 days to maturity), you should transplant around July 20. To start from seed, you would sow indoors around early June.
Planting too late means fruit will still be green when frost arrives. You can pick green tomatoes and ripen them indoors on a windowsill, but they will not develop the same flavor as fruit that ripened on the vine.
Why some tomatoes grow faster than others
Seed catalogs and plant labels list a number called "days to maturity"—usually 60 to 90 days. This is the time from transplanting a seedling to picking ripe fruit, measured under ideal conditions (warm weather, good soil, regular water). Early varieties like 'Early Girl' (60 days) and 'Stupice' (65 days) are bred to fruit quickly, which helps gardeners in cool climates beat the frost.
Large heirloom and slicing types like 'Brandywine', 'Cherokee Purple', and 'Mortgage Lifter' take 80 to 95 days because they grow taller, produce more leaves, and develop bigger fruit. Cherry tomatoes like 'Sungold' and 'Black Cherry' often fall in the middle (65 to 75 days) because the fruit is small and ripens fast, even though the plant keeps growing all season.
Determinate varieties (bush types that stop growing at a set height) often mature faster than indeterminate types (vining plants that keep growing). But actual ripening also depends on sun exposure, soil nutrients, and water consistency—ideal conditions speed everything up, while stress slows it down.
What slows down tomato growth
Cool weather is the biggest brake. If spring is cold or your region has cool nights, flowering will be delayed and fruit will ripen slowly. Inconsistent watering—too much, too little, or erratic—stresses the plant and slows growth. Nutrient deficiencies, especially nitrogen early on and phosphorus later, reduce the speed at which the plant builds leaves and fruit.
Pests and disease also set back the timeline. Hornworms, spider mites, and early blight all reduce leaf area, which means less photosynthesis and slower fruit development. Overcrowding (planting too close together) reduces air circulation and sunlight, both of which slow growth. Pruning too aggressively removes the leaves the plant needs to fuel fruit development.
Harvesting and what happens at the end of the season
Ripe tomatoes can be picked as soon as they reach full color. You do not have to wait for them to be soft—they will continue to soften off the vine. Picking ripe fruit encourages the plant to keep flowering and setting new fruit, so regular harvesting extends your season.
As temperatures drop in fall, flowering slows and then stops. Once nighttime lows drop below 55°F, the plant will not set new fruit. At that point, pick all remaining tomatoes—both ripe and green. Ripe ones are ready to eat. Green tomatoes will ripen indoors in a paper bag or on a sunny windowsill over 1 to 3 weeks, though they will not develop the same depth of flavor as vine-ripened fruit.
When the first frost arrives, the plant dies. There is no way to protect it or extend the season beyond that point, so plan your final harvest before the frost date arrives.
Frequently Asked Questions
Can I grow tomatoes year-round indoors?
Tomatoes need 6 to 8 hours of direct sunlight daily to flower and fruit. A sunny south-facing window may work in summer, but most indoor setups require grow lights. Even with lights, indoor tomatoes grow slower than outdoor plants because light intensity is lower. Many gardeners grow indoors in winter only as an experiment, not as a reliable food source.
Why are my tomato flowers dropping without making fruit?
Flowers drop when nighttime temperatures fall below 55°F or daytime highs exceed 90°F, because pollen does not set under those conditions. Inconsistent watering and nitrogen-heavy fertilizer (which promotes leaves over flowers) also cause flower drop. Water deeply and regularly, and switch to a fertilizer lower in nitrogen once flowering begins.
How long does it take a tomato to ripen once it turns color?
Once a green tomato shows its first color change (a pale yellow or orange spot), it usually takes 20 to 30 days to reach full ripe color. The speed depends on temperature—warmer weather speeds ripening, cool weather slows it. Ripe fruit will soften over several more days if left on the vine.
Do I need to prune tomatoes to make them grow faster?
Light pruning (removing suckers on indeterminate varieties) directs energy toward fruit rather than extra stems, which can speed ripening slightly. Heavy pruning removes too many leaves and slows growth because the plant loses photosynthesis area. Determinate (bush) varieties need little to no pruning.
What should I do with green tomatoes at the end of the season?
Pick all green tomatoes before the first frost and ripen them indoors. Place them in a paper bag with a ripe banana or apple (which release ethylene gas and speed ripening), or set them on a sunny windowsill. They will ripen over 1 to 3 weeks. Tomatoes picked after a frost will not ripen properly.