When to plant marigold in zone 6a — planting calendar

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Showing USDA Zone 6A

Growing SeasonZone 6a

Last frost ~Apr 30First frost ~Oct 10Today

Start indoorsTransplant / sowHarvestFrost risk

MARAPRMAYJUNJULAUGSEPOCT

Start indoors Mar 19 · Sow Apr 30 · First harvest Jun 14 · Wrap by Oct 3

Last spring frostApr 30

Start seeds indoorsMar 19

Direct sowApr 30

First harvestJun 14

Last harvestOct 3

First fall frostOct 10

Why these dates work in zone 6a

Zone 6a's last spring frost averages Apr 30 and first fall frost Oct 10 — about 163 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 6a?

Marigold matures in about 45–55 days from sowing. In zone 6a that means sowing around Apr 30 and first picking around Jun 14.

Will marigold survive frost in zone 6a?

No — marigold is frost-sensitive. In zone 6a, wait until after the last frost (around Apr 30) to plant, and harvest before the first fall frost (around Oct 10).

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