Frost dates for 98671Washougal, WA
The average last spring frost in Washougal is April 29 and the average first fall frost is October 22, giving a typical growing season of about 177 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 29
- Average first fall frost
- Oct 22
- Growing season
- 177 days
Safer after May 15 (1-in-10 risk)
Possible by Sep 27 (1-in-10 risk)
Last frost typically in 177 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 30 · May 15 · Jun 3 | Sep 2 · Oct 1 · Oct 20 | 137 days | 100% |
| Frost / freeze (32°F) | Apr 5 · Apr 29 · May 15 | Sep 27 · Oct 22 · Nov 15 | 177 days | 100% |
| Hard freeze (28°F) | Feb 24 · Mar 28 · May 2 | Oct 18 · Nov 14 · Dec 14 | 232 days | 100% |
Planting calendar for Washougal
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 29 – Jun 4 |
| Tomatoes | Transplant outdoors | May 15 – Jul 2 |
| Peppers | Start seeds indoors | Mar 29 – Apr 29 |
| Peppers | Transplant outdoors | May 29 – Jun 29 |
| Eggplant | Start seeds indoors | Apr 15 – May 14 |
| Eggplant | Transplant outdoors | May 29 – Jun 29 |
| Cucumbers | Sow outdoors | May 29 – Jul 12 |
| Summer squash | Sow outdoors | May 15 – Jun 29 |
| Winter squash & pumpkins | Sow outdoors | May 29 – Jun 29 |
| Snap beans | Sow outdoors | May 15 – Aug 4 |
| Sweet corn | Sow outdoors | May 15 – Jul 2 |
| Watermelon & cantaloupe | Sow outdoors | May 29 – Jun 29 |
| Okra | Sow outdoors | May 22 – Jun 14 |
| Peas | Sow outdoors (spring) | Mar 29 – May 14 |
| Potatoes | Plant outdoors (spring) | Mar 29 – May 29 |
| Onions | Start seeds indoors (spring) | Feb 15 – Mar 14 |
| Onions | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (spring) | Mar 11 – Apr 14 |
| Broccoli | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (fall) | Jun 22 – Jul 2 |
| Broccoli | Transplant outdoors (fall) | Jul 22 – Aug 2 |
| Cabbage | Start seeds indoors (spring) | Mar 1 – Mar 29 |
| Cabbage | Transplant outdoors (spring) | Mar 29 – Apr 29 |
| Cabbage | Start seeds indoors (fall) | Jun 12 – Jul 12 |
| Cabbage | Transplant outdoors (fall) | Jul 12 – Aug 12 |
| Leaf lettuce | Sow outdoors (spring) | Mar 29 – Jun 14 |
| Leaf lettuce | Sow outdoors (fall) | Jul 12 – Aug 28 |
| Spinach | Sow outdoors (spring) | Mar 22 – May 5 |
| Spinach | Sow outdoors (fall) | Jul 29 – Sep 2 |
| Radishes | Sow outdoors (spring) | Mar 29 – May 19 |
| Radishes | Sow outdoors (fall) | Jul 12 – Sep 12 |
| Kale | Sow outdoors (spring) | Apr 15 – May 5 |
| Kale | Sow outdoors (fall) | Jul 5 – Aug 12 |
| Carrots | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Carrots | Sow outdoors (fall) | Jun 12 – Jul 28 |
| Garlic | Plant outdoors (fall) | Oct 12 – Nov 12 |
Where these dates come from
ZIP code 98671 is matched to the NOAA station Skamania Fish Hatchery, WA, 7.8 km away, at 435 ft elevation (116 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Skamania Fish Hatchery, WA (used) | 435 ft | Apr 29 | Oct 22 |
| Troutdale, OR | 33 ft | Mar 26 | Nov 17 |
| Portland Troutdale Ap, OR | 29 ft | Mar 16 | Nov 20 |
| Portland Wfo, OR | 21 ft | Mar 13 | Nov 22 |
Frost dates near Washougal
- Camas, WA 98607 · last Mar 26, first Nov 17
- Troutdale, OR 97060 · last Mar 26, first Nov 17
- Corbett, OR 97019 · last Mar 27, first Nov 18
- Fairview, OR 97024 · last Mar 16, first Nov 20
- Gresham, OR 97030 · last Mar 16, first Nov 20
- Portland, OR 97230 · last Mar 13, first Nov 22
- Vancouver, WA 98683 · last Apr 26, first Oct 18
- Bridal Veil, OR 97010 · last Mar 14, first Nov 27
Frequently asked questions
- When is the last frost in Washougal, WA?
- For ZIP code 98671, the average last spring frost (32°F) is April 29, based on NOAA 1991-2020 climate normals for the Skamania Fish Hatchery, WA weather station. There is a 1-in-10 chance of a frost after May 15.
- When is the first frost in Washougal, WA?
- The average first fall frost (32°F) is October 22. There is a 1-in-10 chance of frost by September 27, so tender plants are at risk from that point on.
- How long is the growing season in 98671?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 177 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.