Crop profile

Tomato crop profile

A demanding but productive summer crop, best transplanted once warmth is stable and managed through successive harvests.

Italiano

Starting method

Transplanting

Direct soil

10 °C

Transplant soil

16 °C

Night minimum

10 °C

Frost buffer

14 days

Heat stop

35 °C

Harvest

70–100 days

Indoor lead

42 days

Key temperatures

0
5
10
15
20
25
30
35
40 °C

Below 10 °CCold risk: slower growth or cold damage.
10–16 °CMinimum range to start: direct sowing from 10 °C, transplanting from 16 °C.
16–30 °CBest range for growth and production.
30–35 °CPerformance drops and plants move into stress.
Above 35 °CPause transplants: heat stress risk.

Tomato cycle

1. Start indoors
Average time:
42 days
2. Transplanting
Soil: at least 16 °C
Night minimum: at least 10 °C
3. Growth
Ideal temperatures 16–30 °C
Avoid peaks above 35 °C
4. Harvest
First harvest around:
70–100 days after transplanting

How to start

Recommended method: transplanting.
Prepare seedlings with mild, steady temperatures.
Transplant when soil has reached at least 16 °C and nights stay above 10 °C.

Temperatures to respect

Direct-sowing soil: minimum 10 °C.
Transplant soil: minimum 16 °C.
Night minimum: minimum 10 °C.
Heat stop: 35 °C.
Suggested frost buffer: 14 days.

Harvest timing

Cycle from transplant to first harvest: about 70–100 days.
Harvest gradually as produce reaches maturity.

Seasonal notes

Protect young plants from late frosts and thermal swings.
In summer, avoid water stress and heat peaks above 35 °C.
Steady growth improves development and harvest quality.

FAQ and sources

When should you plant tomatoes in the garden?

Transplant tomatoes when the frost risk has passed and the soil is stable at least at 16 °C. Use nights as a check too: below 10 °C the plant stops and can weaken. In practice, wait at least two weeks after the expected last frost. Mild climates start earlier, while inland and mountain areas wait longer. A later transplant into real warmth establishes better than an early transplant into cold soil.

Is it better to sow or transplant tomatoes?

For tomatoes, transplanting is better. Sowing in a seed tray is useful if you want specific varieties: start about 42 days before the planned transplant, in a bright and warm place. Direct sowing in open ground is not recommended in most gardens because tomato starts slowly and needs stable heat. Use sturdy seedlings with a short stem and well-formed roots, and plant them slightly deeper to encourage new roots along the stem.

How many days do tomatoes take to harvest?

The first tomatoes usually ripen 70-100 days after transplanting. Cherry tomatoes and early varieties come sooner, while large, meaty tomatoes need more time. Harvest speeds up with moderate warmth, full light, and regular watering. It slows with cold nights, water stress, or days above 35 °C, when flower set can drop. Pick often: removing ripe fruit helps the plant focus energy on the next clusters.

How do you prevent blossom end rot and tomato splitting?

Keep soil moisture constant. Blossom end rot is encouraged by water stress and uneven calcium uptake, while splitting often appears after alternation between drought and heavy watering. Water at the base without wetting the leaves, and use mulch to reduce evaporation and swings. Avoid excessive nitrogen fertilizer: it produces a lot of foliage but can worsen water balance and fruit quality. In pots, consistency is even more important.

Why do tomatoes make flowers but few fruits?

The most common causes are excessive heat, cold nights, too little water, or too much nitrogen. Tomato sets fruit well in warm but not extreme weather; above 35 °C many flowers abort or produce little viable pollen. Nights below 10 °C also stop the plant. Help with steady watering, mulch, good spacing, and light shade during heatwaves. If the plant is very green but not productive, reduce nitrogen and switch to a more balanced feed.