DibbleWhen to plant onions in Zone 7
In Zone 7, the last spring frost usually passes around April 10 and the first fall frost arrives around October 29, leaving about 202 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Long season. Great for succession planting and fall crops.
Planting windows for onions in Zone 7
| Task | Window |
|---|---|
| Start seeds indoors | Jan 30 to Feb 13 |
| Transplant | Mar 27 to Apr 10 |
| Estimated harvest | Jul 5 to Jul 19 |
The harvest estimate counts 100 days to maturity, then a picking window of about 14 days. These windows use typical frost dates for Zone 7; Dibble pins them to your exact ZIP code.
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Onion in a Zone 7 season
Zone 7 gives about 202 frost-free days. Onion needs roughly 100 days from transplant. That leaves about 102 days of slack, so there is room for a late start or a second planting.
How to grow onions
Start seeds indoors about 8 weeks before planting out, or use sets. Match the variety to your day length (short-day types near the equator, long-day types far from it) and plant out in the cool part of the year. Cure the bulbs in dry weather once the tops fall over.
Companion plants
Good neighbors for Onion:
Better kept apart:
Onion in other zones
Not in Zone 7? Pick your zone for the same dated windows.
Keep exploring
Onion: the full growing guide · The Zone 7 planting calendar · Every crop and zone
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.