When to plant leek 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

OCTNOVDECJANFEBMARAPRMAYJUN

Start indoors Oct 23 · Transplant Jan 1 · First harvest Apr 11 · Wrap by Jun 6

Last spring frostJan 15

Start seeds indoorsOct 23

Transplant outJan 1

First harvestApr 11

Last harvestJun 6

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. Leek tolerates light frost, so you can set plants out ahead of the last-frost date and keep harvesting into the cooler fall. Starting seeds indoors 12 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does leek take to grow in zone 10b?

Leek matures in about 100–120 days from transplanting. In zone 10b that means setting plants out around Jan 1 and first picking around Apr 11.

Will leek survive frost in zone 10b?

Yes — leek tolerates light frost. In zone 10b you can set plants out a little before the last frost (around Jan 15) and keep harvesting past the first fall frost (around Dec 31).

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