Frost dates for 97071Woodburn, OR
The average last spring frost in Woodburn is March 16 and the average first fall frost is November 14, giving a typical growing season of about 242 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 16
- Average first fall frost
- Nov 14
- Growing season
- 242 days
Safer after Apr 7 (1-in-10 risk)
Possible by Oct 27 (1-in-10 risk)
First frost typically in 12 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 27 · Apr 15 · May 4 | Oct 9 · Oct 26 · Nov 14 | 193 days | 100% |
| Frost / freeze (32°F) | Feb 21 · Mar 16 · Apr 7 | Oct 27 · Nov 14 · Dec 6 | 242 days | 100% |
| Hard freeze (28°F) | Jan 4 · Feb 15 · Mar 8 | Nov 9 · Dec 1 · Dec 30 | 292 days | 99% |
Planting calendar for Woodburn
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 13 – Apr 21 |
| Tomatoes | Transplant outdoors | Apr 1 – Jul 25 |
| Peppers | Start seeds indoors | Feb 13 – Mar 16 |
| Peppers | Transplant outdoors | Apr 15 – May 16 |
| Eggplant | Start seeds indoors | Mar 2 – Mar 31 |
| Eggplant | Transplant outdoors | Apr 15 – May 16 |
| Cucumbers | Sow outdoors | Apr 15 – Aug 4 |
| Summer squash | Sow outdoors | Apr 1 – May 16 |
| Winter squash & pumpkins | Sow outdoors | Apr 15 – May 16 |
| Snap beans | Sow outdoors | Apr 1 – Aug 27 |
| Sweet corn | Sow outdoors | Apr 1 – Jul 25 |
| Watermelon & cantaloupe | Sow outdoors | Apr 15 – May 16 |
| Okra | Sow outdoors | Apr 8 – May 1 |
| Peas | Sow outdoors (spring) | Feb 13 – Mar 31 |
| Potatoes | Plant outdoors (spring) | Feb 13 – Apr 15 |
| Onions | Start seeds indoors (spring) | Jan 2 – Jan 29 |
| Onions | Transplant outdoors (spring) | Mar 2 – Mar 31 |
| Broccoli | Start seeds indoors (spring) | Jan 26 – Mar 1 |
| Broccoli | Transplant outdoors (spring) | Mar 2 – Mar 31 |
| Broccoli | Start seeds indoors (fall) | Jul 15 – Jul 25 |
| Broccoli | Transplant outdoors (fall) | Aug 14 – Aug 25 |
| Cabbage | Start seeds indoors (spring) | Jan 16 – Feb 13 |
| Cabbage | Transplant outdoors (spring) | Feb 13 – Mar 16 |
| Cabbage | Start seeds indoors (fall) | Jul 5 – Aug 4 |
| Cabbage | Transplant outdoors (fall) | Aug 4 – Sep 4 |
| Leaf lettuce | Sow outdoors (spring) | Feb 13 – May 1 |
| Leaf lettuce | Sow outdoors (fall) | Aug 4 – Sep 20 |
| Spinach | Sow outdoors (spring) | Feb 6 – Mar 22 |
| Spinach | Sow outdoors (fall) | Aug 21 – Sep 25 |
| Radishes | Sow outdoors (spring) | Feb 13 – Apr 5 |
| Radishes | Sow outdoors (fall) | Aug 4 – Oct 5 |
| Kale | Sow outdoors (spring) | Mar 2 – Mar 22 |
| Kale | Sow outdoors (fall) | Jul 28 – Sep 4 |
| Carrots | Sow outdoors (spring) | Mar 16 – May 1 |
| Carrots | Sow outdoors (fall) | Jul 5 – Aug 20 |
| Garlic | Plant outdoors (fall) | Nov 4 – Dec 5 |
Where these dates come from
ZIP code 97071 is matched to the NOAA station Aurora State Ap, OR, 13.5 km away, at 196 ft elevation (12 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Aurora State Ap, OR (used) | 196 ft | Mar 16 | Nov 14 |
| Silverton, OR | 408 ft | Mar 28 | Nov 10 |
| N Willamette Exp Stn, OR | 150 ft | Mar 18 | Nov 13 |
| Rex 1 S, OR | 515 ft | Mar 21 | Nov 22 |
Frost dates near Woodburn
- Gervais, OR 97026 · last Mar 16, first Nov 14
- Hubbard, OR 97032 · last Mar 16, first Nov 14
- Donald, OR 97020 · last Mar 16, first Nov 14
- Mount Angel, OR 97362 · last Mar 28, first Nov 10
- Aurora, OR 97002 · last Mar 16, first Nov 14
- Saint Paul, OR 97137 · last Apr 15, first Oct 26
- Salem, OR 97305 · last Apr 3, first Nov 1
- Dayton, OR 97114 · last Apr 15, first Oct 26
Frequently asked questions
- When is the last frost in Woodburn, OR?
- For ZIP code 97071, the average last spring frost (32°F) is March 16, based on NOAA 1991-2020 climate normals for the Aurora State Ap, OR weather station. There is a 1-in-10 chance of a frost after April 7.
- When is the first frost in Woodburn, OR?
- The average first fall frost (32°F) is November 14. There is a 1-in-10 chance of frost by October 27, so tender plants are at risk from that point on.
- How long is the growing season in 97071?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 242 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.