Zone 6a covers 28 days of last-frost dates. We measured Omaha, NE at Apr 14 and Flagstaff, AZ at May 12. 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 6a
Zone 6a's last spring frost averages Apr 22 and first fall frost Nov 1 — about 193 frost-free days. Oregano tolerates light frost, so you can set plants out ahead of the last-frost date and keep harvesting into the cooler fall. Starting seeds indoors 8 weeks ahead gives strong transplants ready the moment the soil warms.
Common questions
How long does oregano take to grow in zone 6a?
Oregano matures in about 60–80 days from transplanting. In zone 6a that means setting plants out around Apr 15 and first picking around Jun 14.
Will oregano survive frost in zone 6a?
Yes — oregano tolerates light frost. In zone 6a you can set plants out a little before the last frost (around Apr 22) and keep harvesting past the first fall frost (around Nov 1).
For soil, spacing, pests and companion planting, see the full oregano growing guide →