Oregon planting calendar
Most of Oregon falls in USDA hardiness zones 4b–9b. Your exact zone depends on your local area — look it up by ZIP code — then open your zone's month-by-month calendar below.
USDA hardiness zones in Oregon
| Zone | Coldest temps | Avg. last spring frost |
|---|---|---|
| Zone 4b | -25 to -20°F | May 10 |
| Zone 5a | -20 to -15°F | May 5 |
| Zone 5b | -15 to -10°F | Apr 30 |
| Zone 6a | -10 to -5°F | Apr 21 |
| Zone 6b | -5 to 0°F | Apr 15 |
| Zone 7a | 0 to 5°F | Apr 7 |
| Zone 7b | 5 to 10°F | Apr 1 |
| Zone 8a | 10 to 15°F | Mar 22 |
| Zone 8b | 15 to 20°F | Mar 15 |
| Zone 9a | 20 to 25°F | Feb 28 |
| Zone 9b | 25 to 30°F | Feb 15 |