Days to Harvest Calculator & Sow & Harvest Dates
Times the harvest of tomatoes
Plan your timing both ways — enter a sowing date to get the harvest date, or a target harvest date to get the latest sow-by date, using each crop's days to maturity, with a countdown.
Default is a typical figure for tomato (from transplanting). Adjust to your variety's days to maturity.
Sow tomato on 19 Jun 2026 and, at 75 days to maturity, expect to harvest around 2 Sep 2026 — 75 days until harvest.
Next: stagger sowings a week or two apart for a continuous harvest, and check the date suits your season and frost windows. Days to maturity shifts with temperature — cool weather lengthens it.
A calendar estimate from days-to-maturity. Use Growing Degree Days for a temperature-driven maturity prediction.
Days to harvest — key facts
- Harvest date
- sowing date + days to maturity
- Sow-by date
- harvest date − days to maturity
- Radish
- ≈ 30 days
- Tomato (transplant)
- ≈ 75 days
- Wheat
- ≈ 120 days
- Onion (transplant)
- ≈ 130 days
- Cool weather
- lengthens days to maturity
- Privacy
- Runs in your browser; nothing uploaded
Time your crop, forwards or backwards
Most planting decisions come down to a date. Sow now and when will it be ready? Or you need a crop ready for a market, festival or before the first frost — so when must you sow? This tool answers both by adding or subtracting the crop's days to maturity. Forwards, it turns a sowing date into an expected harvest date; backwards, it turns a target harvest into the latest sow-by date, with a live countdown from today either way.
It's built for real planning: stagger sowings a week or two apart and read each one's harvest date for a continuous supply, or back-date several crops to share a harvest window. Days to maturity is editable, so start from the typical figure and refine it to your variety. Remember it assumes fair weather — cool spells stretch the time, so check the dates against your season and frost windows, and use Growing Degree Days for a temperature-based prediction.
Predict your harvest
Turn any sowing date into the expected harvest date with a day-by-day countdown.
Back-date the sowing
Know the latest date to sow to hit a target harvest for a market or before frost.
Plan succession sowings
Stagger plantings and read each harvest date for a steady, continuous supply.
Tune to your variety
Edit the days to maturity to match the exact figure on your seed packet.
Frequently Asked Questions
How do I calculate the harvest date?+
Add the crop's days to maturity to the sowing date. If you sow wheat (about 120 days) on 1 March, harvest falls around 29 June. This tool does it instantly and also works backwards — give a target harvest date and it tells you the latest date to sow.
What is 'days to maturity'?+
It's the typical number of days from sowing (or, for some crops, from transplanting) until the crop is ready to harvest. It's a variety characteristic printed on seed packets, though warmth, daylength and conditions shift it. The tool provides a typical figure per crop that you can adjust.
Can I work out when to sow for a target harvest?+
Yes — switch to 'I want a harvest date' mode, enter your target harvest date and the days to maturity, and the tool subtracts to give the latest sow-by date. This is ideal for timing a crop for a festival, market window or before a frost.
Is days to maturity counted from sowing or transplanting?+
It depends on the crop. Direct-sown crops count from sowing; transplanted crops like tomato, cabbage and onion usually count from transplanting. The tool notes which crops are typically transplanted so you can set the start date correctly.
Why is my crop maturing slower than the days listed?+
Days to maturity assumes favourable temperatures. Cool weather, short days, low light, poor nutrition or water stress all stretch the time to harvest, while warmth shortens it. For a temperature-driven estimate, use our Growing Degree Days calculator.
What is succession or staggered sowing?+
Sowing small batches a week or two apart so they mature in sequence, giving a steady harvest instead of a single glut. Use this tool to plan each sowing's harvest date and space them for continuous supply.
Does this account for frost or season length?+
No — it only adds or subtracts days to maturity. You should check the resulting dates against your local planting season and first/last frost dates to make sure the crop has a frost-free window to grow and ripen.
Can I change the days to maturity?+
Yes — the field is editable. Start from the typical figure shown for the crop, then enter your specific variety's days to maturity from the seed packet for the most accurate date.
Which crops are included?+
Twenty common field and vegetable crops with typical maturities — from quick radish (30 days) and spinach (45) to long-season onion (130) and cotton (170). You can also enter any days-to-maturity value for crops not listed.
How accurate is the harvest date?+
It's a sound calendar estimate from days to maturity. Real harvest timing varies with weather, variety and management, so treat the date as a target and watch the crop for true maturity signs as it approaches.