When to plant zinnia in zone 7b — planting calendar

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Showing USDA Zone 7B

Growing SeasonZone 7b

Last frost ~Apr 5First frost ~Nov 1Today

Start indoorsTransplant / sowHarvestFrost risk

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Start indoors Mar 8 · Sow Apr 5 · First harvest May 25 · Wrap by Aug 17

Last spring frostApr 5

Start seeds indoorsMar 8

Direct sowApr 5

First harvestMay 25

Last harvestAug 17

First fall frostNov 1

Why these dates work in zone 7b

Zone 7b's last spring frost averages Apr 5 and first fall frost Nov 1 — about 210 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 7b?

Zinnia matures in about 50–70 days from sowing. In zone 7b that means sowing around Apr 5 and first picking around May 25.

Will zinnia survive frost in zone 7b?

No — zinnia is frost-sensitive. In zone 7b, wait until after the last frost (around Apr 5) to plant, and harvest before the first fall frost (around Nov 1).

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