Frost Dates for Woodburn, OR
In Woodburn, OR, the average last spring frost is around Mar 16 and the average first fall frost around Nov 14, for a growing season of about 242 days. For frost-tender plants, wait until Apr 7, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Aurora State Airport, OR weather station, 8 miles away, elevation 196 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | Apr 7 | Oct 27 |
| 20% | Mar 31 | Nov 1 |
| 30% | Mar 25 | Nov 5 |
| 40% | Mar 20 | Nov 10 |
| 50% | Mar 16 | Nov 14 |
| 60% | Mar 11 | Nov 18 |
| 70% | Mar 6 | Nov 23 |
| 80% | Feb 28 | Nov 29 |
| 90% | Feb 21 | Dec 6 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | Apr 15 | Oct 26 |
| Frost / freeze (32°F) | Mar 16 | Nov 14 |
| Hard freeze (28°F) | Feb 15 | Dec 1 |
Planting calendar for Woodburn
Transplant Mar 23 – Apr 6
Transplant Mar 30 – Apr 13
Transplant Mar 30 – Apr 13
Transplant Mar 23 – Apr 6
Sow or transplant Mar 23 – Apr 6
Sow or transplant Mar 23 – Apr 6
Sow or transplant Mar 30 – Apr 13
Sow or transplant Feb 16 – Mar 2
Fall sowing Sep 19 – Oct 17
Fall sowing Sep 19 – Oct 10
Fall sowing Sep 5 – Sep 19
Sow or transplant Feb 16 – Mar 2
Fall sowing Sep 5 – Oct 3
Transplant Mar 2 – Mar 16
Fall sowing Aug 22 – Sep 5
Transplant Feb 23 – Mar 9
Fall sowing Aug 22 – Sep 5
Fall sowing Aug 22 – Sep 5
Fall sowing Oct 3 – Oct 24
Fall sowing Sep 5 – Sep 19
Plant Feb 16 – Mar 2
Based on the average last frost (Mar 16) and first frost (Nov 14). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.