When to plant nasturtium in zone 9b — planting calendar

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Showing USDA Zone 9B

Growing SeasonZone 9b

Last frost ~Feb 15First frost ~Dec 10Today

Start indoorsTransplant / sowHarvestFrost risk

FEBMARAPRMAYJUNJUL

Sow Feb 22 · First harvest Apr 13 · Wrap by Jul 6

Last spring frostFeb 15

Direct sowFeb 22

First harvestApr 13

Last harvestJul 6

First fall frostDec 10

Why these dates work in zone 9b

Zone 9b's last spring frost averages Feb 15 and first fall frost Dec 10 — about 298 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 9b?

Nasturtium matures in about 50–70 days from sowing. In zone 9b that means sowing around Feb 22 and first picking around Apr 13.

Will nasturtium survive frost in zone 9b?

No — nasturtium is frost-sensitive. In zone 9b, wait until after the last frost (around Feb 15) to plant, and harvest before the first fall frost (around Dec 10).

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