When to plant nasturtium in zone 9a — planting calendar

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Showing USDA Zone 9A

Growing SeasonZone 9a

Last frost ~Feb 28First frost ~Nov 30Today

Start indoorsTransplant / sowHarvestFrost risk

FEBMARAPRMAYJUNJUL

Sow Mar 7 · First harvest Apr 26 · Wrap by Jul 19

Last spring frostFeb 28

Direct sowMar 7

First harvestApr 26

Last harvestJul 19

First fall frostNov 30

Why these dates work in zone 9a

Zone 9a's last spring frost averages Feb 28 and first fall frost Nov 30 — about 275 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 9a?

Nasturtium matures in about 50–70 days from sowing. In zone 9a that means sowing around Mar 7 and first picking around Apr 26.

Will nasturtium survive frost in zone 9a?

No — nasturtium is frost-sensitive. In zone 9a, wait until after the last frost (around Feb 28) to plant, and harvest before the first fall frost (around Nov 30).

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