When to plant marigold in zone 5a — planting calendar

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Showing USDA Zone 5A

Growing SeasonZone 5a

Last frost ~May 10First frost ~Oct 1Today

Start indoorsTransplant / sowHarvestFrost risk

MARAPRMAYJUNJULAUGSEPOCT

Start indoors Mar 29 · Sow May 10 · First harvest Jun 24 · Wrap by Sep 24

Last spring frostMay 10

Start seeds indoorsMar 29

Direct sowMay 10

First harvestJun 24

Last harvestSep 24

First fall frostOct 1

Why these dates work in zone 5a

Zone 5a's last spring frost averages May 10 and first fall frost Oct 1 — about 144 frost-free days. Marigold is frost-sensitive, so the around last frost timing builds in a safety margin against a late cold snap — setting plants out too early risks losing them to frost. Starting seeds indoors 6 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does marigold take to grow in zone 5a?

Marigold matures in about 45–55 days from sowing. In zone 5a that means sowing around May 10 and first picking around Jun 24.

Will marigold survive frost in zone 5a?

No — marigold is frost-sensitive. In zone 5a, wait until after the last frost (around May 10) to plant, and harvest before the first fall frost (around Oct 1).

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