When to plant nasturtium in zone 10b — planting calendar

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Showing USDA Zone 10B

Growing SeasonZone 10b

Last frost ~Jan 15First frost ~Dec 31Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPRMAYJUN

Sow Jan 22 · First harvest Mar 13 · Wrap by Jun 5

Last spring frostJan 15

Direct sowJan 22

First harvestMar 13

Last harvestJun 5

First fall frostDec 31

Why these dates work in zone 10b

Zone 10b's last spring frost averages Jan 15 and first fall frost Dec 31 — about 350 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 10b?

Nasturtium matures in about 50–70 days from sowing. In zone 10b that means sowing around Jan 22 and first picking around Mar 13.

Will nasturtium survive frost in zone 10b?

No — nasturtium is frost-sensitive. In zone 10b, wait until after the last frost (around Jan 15) to plant, and harvest before the first fall frost (around Dec 31).

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