Planting and Harvest Date Calculator
Find the harvest date from the planting date, or the date you must plant to harvest on time.
Part of the 🌾 Farmers toolkit, with more tools made for the job.
When will a crop be ready?
Example: planted on 15 March 2026 and a 120 day crop is ready on Monday, 13 July 2026.
When do I need to plant?
Example: harvest by 14 October 2026 with a 120 day crop means planting by Tuesday, 16 June 2026.
Days to maturity depends on the crop, the variety and the weather. Use the figure from your seed supplier or your own records.
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Enter a planting date and the days the crop takes to mature, and this gives the harvest date. Or enter the date you want to harvest by and it works back to the latest date you can plant.
Days to maturity is on most seed packets and variety sheets. For crops sown directly, sellers usually count from sowing. For crops grown as transplants, many count from the day you transplant, and some from sowing, so check your supplier's wording. A crop that takes 120 days planted on 15 March is ready around 13 July. The weather can move that, so treat it as a planning date, not a promise.
How it’s worked out
- Harvest date: the planting date plus the days to maturity. The calculation counts every calendar day, including weekends, and handles month ends and leap years.
- Plant-by date: the harvest date minus the days to maturity.
- Weeks are the days divided by 7.
A crop planted on 15 March 2026 that takes 120 days is ready on Monday, 13 July 2026, which is about 17 weeks later.
Common mistakes
- Using days to maturity from the wrong source. Different varieties of the same crop can differ by weeks, so use the figure for the variety you are sowing.
- Counting from sowing when the figure counts from transplanting, or the other way round. Check which one the supplier means.
- Leaving no slack. A cold spell or a wet week can add days, so leave a margin before the date you cannot miss.
Questions
Where do I find days to maturity?
On the seed packet or in the supplier's variety guide. Your own records from past seasons are even better, because they reflect your soil and climate.
Do I count from sowing or from transplanting?
Use the date your supplier counts from. For direct-sown crops that is normally the sowing date. For transplants, many suppliers count from transplanting and some from sowing. If it counts from transplanting, put in the transplant date.
Does it allow for weather?
No. It counts calendar days from the number you give it. Cold, heat and drought can shorten or lengthen the real time.
Can I use it for livestock or other timings?
Yes. Any "start date plus N days" works, for example a gestation period or a withdrawal period. Check the figure with your vet or supplier.
Where the method comes from
Estimates only
These are estimates and general information, not agronomic, financial or professional advice. Rates, timings and costs depend on your crop, land, weather and local rules.
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