When to plant thyme 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

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Start indoors Apr 4 · Transplant May 23 · First harvest Jul 22 · Wrap by Sep 10

Last spring frostMay 30

Start seeds indoorsApr 4

Transplant outMay 23

First harvestJul 22

Last harvestSep 10

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. Thyme 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 8 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

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

Thyme matures in about 60–90 days from transplanting. In zone 3a that means setting plants out around May 23 and first picking around Jul 22.

Will thyme survive frost in zone 3a?

Yes — thyme tolerates light frost. In zone 3a you can set plants out a little before the last frost (around May 30) and keep harvesting past the first fall frost (around Sep 10).

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