Zone 7a covers 30 days of last-frost dates. We measured Fayetteville, AR at Mar 31 and Ogden, UT at Apr 30. Give us your town or ZIP and we'll use ten years of daily lows recorded at your own coordinates instead of the middle of that range.
Why these dates work in zone 7a
Zone 7a's last spring frost averages Apr 13 and first fall frost Nov 12 — about 213 frost-free days. Collards tolerates light frost, so you can sow ahead of the last-frost date and keep harvesting into the cooler fall. Starting seeds indoors 5 weeks ahead gives strong transplants ready the moment the soil warms. There's also room for a fall succession sowing around Sep 3 for a second harvest before frost.
Common questions
How long does collards take to grow in zone 7a?
Collards matures in about 60–85 days from sowing. In zone 7a that means sowing around Mar 23 and first picking around May 22.
Will collards survive frost in zone 7a?
Yes — collards tolerates light frost. In zone 7a you can sow a little before the last frost (around Apr 13) and keep harvesting past the first fall frost (around Nov 12).
Can I plant a second crop of collards in zone 7a?
Yes — in zone 7a there's time for a fall sowing around Sep 3 for a second harvest before frost.
For soil, spacing, pests and companion planting, see the full collards growing guide →