Frost dates for 97056Scappoose, OR
The average last spring frost in Scappoose is April 18 and the average first fall frost is November 7, giving a typical growing season of about 201 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 18
- Average first fall frost
- Nov 7
- Growing season
- 201 days
Safer after May 26 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 8 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) | Apr 18 · May 6 · Jun 9 | Oct 6 · Oct 24 · Nov 10 | 168 days | 100% |
| Frost / freeze (32°F) | Mar 20 · Apr 18 · May 26 | Oct 21 · Nov 7 · Nov 26 | 201 days | 100% |
| Hard freeze (28°F) | Feb 20 · Mar 24 · May 6 | Nov 3 · Nov 24 · Dec 16 | 244 days | 100% |
Planting calendar for Scappoose
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 | Mar 18 – May 24 |
| Tomatoes | Transplant outdoors | May 4 – Jul 18 |
| Peppers | Start seeds indoors | Mar 18 – Apr 18 |
| Peppers | Transplant outdoors | May 18 – Jun 18 |
| Eggplant | Start seeds indoors | Apr 4 – May 3 |
| Eggplant | Transplant outdoors | May 18 – Jun 18 |
| Cucumbers | Sow outdoors | May 18 – Jul 28 |
| Summer squash | Sow outdoors | May 4 – Jun 18 |
| Winter squash & pumpkins | Sow outdoors | May 18 – Jun 18 |
| Snap beans | Sow outdoors | May 4 – Aug 20 |
| Sweet corn | Sow outdoors | May 4 – Jul 18 |
| Watermelon & cantaloupe | Sow outdoors | May 18 – Jun 18 |
| Okra | Sow outdoors | May 11 – Jun 3 |
| Peas | Sow outdoors (spring) | Mar 18 – May 3 |
| Potatoes | Plant outdoors (spring) | Mar 18 – May 18 |
| Onions | Start seeds indoors (spring) | Feb 4 – Mar 3 |
| Onions | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (spring) | Feb 28 – Apr 3 |
| Broccoli | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (fall) | Jul 8 – Jul 18 |
| Broccoli | Transplant outdoors (fall) | Aug 7 – Aug 18 |
| Cabbage | Start seeds indoors (spring) | Feb 18 – Mar 18 |
| Cabbage | Transplant outdoors (spring) | Mar 18 – Apr 18 |
| Cabbage | Start seeds indoors (fall) | Jun 28 – Jul 28 |
| Cabbage | Transplant outdoors (fall) | Jul 28 – Aug 28 |
| Leaf lettuce | Sow outdoors (spring) | Mar 18 – Jun 3 |
| Leaf lettuce | Sow outdoors (fall) | Jul 28 – Sep 13 |
| Spinach | Sow outdoors (spring) | Mar 11 – Apr 24 |
| Spinach | Sow outdoors (fall) | Aug 14 – Sep 18 |
| Radishes | Sow outdoors (spring) | Mar 18 – May 8 |
| Radishes | Sow outdoors (fall) | Jul 28 – Sep 28 |
| Kale | Sow outdoors (spring) | Apr 4 – Apr 24 |
| Kale | Sow outdoors (fall) | Jul 21 – Aug 28 |
| Carrots | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Carrots | Sow outdoors (fall) | Jun 28 – Aug 13 |
| Garlic | Plant outdoors (fall) | Oct 28 – Nov 28 |
Where these dates come from
ZIP code 97056 is matched to the NOAA station Saint Helens Rfd, OR, 9.4 km away, at 269 ft elevation (13 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Saint Helens Rfd, OR (used) | 269 ft | Apr 18 | Nov 7 |
| Scappoose Ind Ap, OR | 55 ft | Apr 10 | Nov 2 |
| Vancouver 4 Nne, WA | 210 ft | Apr 26 | Oct 18 |
| Vancouver Pearson Ap, WA | 30 ft | Mar 29 | Nov 9 |
Frost dates near Scappoose
- Warren, OR 97053 · last Apr 18, first Nov 7
- Saint Helens, OR 97051 · last Apr 18, first Nov 7
- Portland, OR 97231 · last Apr 16, first Oct 23
- North Plains, OR 97133 · last May 8, first Oct 1
- Columbia City, OR 97018 · last Apr 10, first Nov 2
- Ridgefield, WA 98642 · last Apr 26, first Oct 16
- Vancouver, WA 98685 · last Mar 29, first Nov 9
- Deer Island, OR 97054 · last Apr 18, first Nov 7
Frequently asked questions
- When is the last frost in Scappoose, OR?
- For ZIP code 97056, the average last spring frost (32°F) is April 18, based on NOAA 1991-2020 climate normals for the Saint Helens Rfd, OR weather station. There is a 1-in-10 chance of a frost after May 26.
- When is the first frost in Scappoose, OR?
- The average first fall frost (32°F) is November 7. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 97056?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 201 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.