Cool-season crops
Onion planting calendar and growing plan
This record covers bulb onions started from seed, with a transplant path and separate spacing systems. Onion sets and bunching onions are different planning cases.
Plan dates for Onion
Editable exampleTransplant outside
Apr 3, 2027 Suggested windowDirect sow
A reviewed rule is not available for this action. StatusPaired transplant date (optional)
| Transplant outside | Start indoors |
|---|---|
| Apr 3, 2027 | Jan 23 – Feb 6, 2027 |
Sowing windows combine possible transplant dates. Choose a paired transplant date to narrow the nursery window. Wait for suitable soil and local conditions.
Direct sowing and transplanting are alternative ways to start a crop. Keep the tasks that match your method.
Sources and conditions
The chart’s eight-to-ten-week nursery range is selected. A separate Minnesota guide recommends a longer nursery period, which is not silently combined with it.
- These are reviewed planning references. Check the variety, local soil and weather before acting; a frost date is not a forecast.
- This is bulb onion raised from seed and transplanted; choose a day-length type suited to your location.
The calendar is for seed-grown bulb-onion transplants, not sets or perennial multiplying onions.
- These are reviewed planning references. Check the variety, local soil and weather before acting; a frost date is not a forecast.
- This is bulb onion raised from seed and transplanted; choose a day-length type suited to your location.
No numeric frost-relative direct-sowing window is reviewed here; soil readiness and local guidance still apply.
- These are reviewed planning references. Check the variety, local soil and weather before acting; a frost date is not a forecast.
- The direct-sowing guide uses soil and regional-season guidance rather than a numeric frost offset here.
A planning reference, not a weather forecast.
Choose the right onion type
Day-length adaptation matters for bulb formation. Record the variety before using the nursery schedule; a frost offset does not choose the appropriate onion for a location.
Keep the selected nursery model
The calendar chart and the Minnesota guide offer different indoor durations. This record consistently uses the chart for dates, with its source retained in the plan.
Choose seed or transplant spacing
The source gives different row ranges for direct-seeded and transplanted onions. Select the intended system before counting plants. No bunching-onion repeat interval is borrowed for this bulb crop.
Questions growers ask
Can I use the indoor date for onion sets?
No. The nursery schedule is for seed-grown transplants. Sets do not need that indoor seed-starting action.
Sources and conditions
These sources describe particular climates and growing methods. Use the conditions alongside the numbers.
Seed-Starting Date Calculator ↗
General nursery and setting-out reference, using a user-supplied spring frost-free date. Nursery duration is measured before setting out.
Growing onions in home gardens ↗
Bulb onions, with separate seed and transplant row spacing; Minnesota day-length context.