Succession planting planner
Pick a crop and the window you want to keep harvesting through. You'll get every sowing date at the right interval.
Cucumber is usually re-sown every 21 days. It matures in 50–70 days, so a spring sowing is ready roughly that long after you plant it.
How this is calculated
Sowing dates step forward from your first date by the crop’s re-sow interval (about 10 days for radish, 2 weeks for beans and lettuce, 3 weeks for cucumbers) until the last useful date you set. For a spring window, stop before summer heat; for a fall window, the last sowing should still have enough days to mature before your first frost.