When to plant nasturtium in zone 3a — planting calendar

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Showing USDA Zone 3A

Growing SeasonZone 3a

Last frost ~May 30First frost ~Sep 10Today

Start indoorsTransplant / sowHarvestFrost risk

MAYJUNJULAUGSEP

Sow Jun 6 · First harvest Jul 26 · Wrap by Sep 3

Last spring frostMay 30

Direct sowJun 6

First harvestJul 26

Last harvestSep 3

First fall frostSep 10

Why these dates work in zone 3a

Zone 3a's last spring frost averages May 30 and first fall frost Sep 10 — about 103 frost-free days. Nasturtium is frost-sensitive, so the 1w after frost timing builds in a safety margin against a late cold snap — setting plants out too early risks losing them to frost.

Common questions

How long does nasturtium take to grow in zone 3a?

Nasturtium matures in about 50–70 days from sowing. In zone 3a that means sowing around Jun 6 and first picking around Jul 26.

Will nasturtium survive frost in zone 3a?

No — nasturtium is frost-sensitive. In zone 3a, wait until after the last frost (around May 30) to plant, and harvest before the first fall frost (around Sep 10).

For soil, spacing, pests and companion planting, see the full nasturtium growing guide →