When to plant zinnia 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

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Start indoors Apr 2 · Sow Apr 30 · First harvest Jun 19 · Wrap by Sep 11

Last spring frostApr 30

Start seeds indoorsApr 2

Direct sowApr 30

First harvestJun 19

Last harvestSep 11

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. Zinnia 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 4 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does zinnia take to grow in zone 6a?

Zinnia matures in about 50–70 days from sowing. In zone 6a that means sowing around Apr 30 and first picking around Jun 19.

Will zinnia survive frost in zone 6a?

No — zinnia 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 zinnia growing guide →