Zone 8b covers 47 days of last-frost dates. We measured Fort Worth, TX at Feb 18 and Eugene, OR at Apr 6. 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 8b
Zone 8b's last spring frost averages Mar 6 and first fall frost Nov 22 — about 261 frost-free days. Nasturtium is frost-sensitive, so the 1w after frost timing builds in a safety margin against a late cold snap — setting plants out too early risks losing them to frost.
Common questions
How long does nasturtium take to grow in zone 8b?
Nasturtium matures in about 50–70 days from sowing. In zone 8b that means sowing around Mar 13 and first picking around May 2.
Will nasturtium survive frost in zone 8b?
No — nasturtium is frost-sensitive. In zone 8b, wait until after the last frost (around Mar 6) to plant, and harvest before the first fall frost (around Nov 22).
For soil, spacing, pests and companion planting, see the full nasturtium growing guide →