DibbleWhen to plant nasturtiums in Zone 4
In Zone 4, the last spring frost usually passes around May 10 and the first fall frost arrives around September 21, leaving about 134 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Cool climate with a brief warm window. Indoor starts and season extension help.
Planting windows for nasturtiums in Zone 4
| Task | Window |
|---|---|
| Direct sow | May 17 to May 31 |
| Estimated harvest | Jul 6 to Oct 4 |
The harvest estimate counts 50 days to maturity, then a picking window of about 90 days. These windows use typical frost dates for Zone 4; Dibble pins them to your exact ZIP code.
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Nasturtium in a Zone 4 season
Zone 4 gives about 134 frost-free days. Nasturtium needs roughly 50 days from sowing. That leaves about 84 days of slack, so there is room for a late start or a second planting.
How to grow nasturtiums
Sow seeds after last frost in lean soil. The edible leaves and flowers lure aphids away from your vegetables.
Companion plants
Good neighbors for Nasturtium:
Nasturtium in other zones
Not in Zone 4? Pick your zone for the same dated windows.
Keep exploring
Nasturtium: the full growing guide · The Zone 4 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.