Frost dates for 98535Copalis Beach, WA
The average last spring frost in Copalis Beach is March 30 and the average first fall frost is November 14, giving a typical growing season of about 228 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 30
- Average first fall frost
- Nov 14
- Growing season
- 228 days
Safer after Apr 25 (1-in-10 risk)
Possible by Oct 22 (1-in-10 risk)
First frost typically in 14 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 6 · Apr 27 · May 13 | Oct 5 · Oct 23 · Nov 13 | 181 days | 100% |
| Frost / freeze (32°F) | Feb 28 · Mar 30 · Apr 25 | Oct 22 · Nov 14 · Dec 9 | 228 days | 100% |
| Hard freeze (28°F) | Dec 28 · Feb 21 · Mar 23 | Nov 10 · Dec 8 · Jan 31 | 299 days | 95% |
Planting calendar for Copalis Beach
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 27 – May 5 |
| Tomatoes | Transplant outdoors | Apr 15 – Jul 25 |
| Peppers | Start seeds indoors | Feb 27 – Mar 30 |
| Peppers | Transplant outdoors | Apr 29 – May 30 |
| Eggplant | Start seeds indoors | Mar 16 – Apr 14 |
| Eggplant | Transplant outdoors | Apr 29 – May 30 |
| Cucumbers | Sow outdoors | Apr 29 – Aug 4 |
| Summer squash | Sow outdoors | Apr 15 – May 30 |
| Winter squash & pumpkins | Sow outdoors | Apr 29 – May 30 |
| Snap beans | Sow outdoors | Apr 15 – Aug 27 |
| Sweet corn | Sow outdoors | Apr 15 – Jul 25 |
| Watermelon & cantaloupe | Sow outdoors | Apr 29 – May 30 |
| Okra | Sow outdoors | Apr 22 – May 15 |
| Peas | Sow outdoors (spring) | Feb 27 – Apr 14 |
| Potatoes | Plant outdoors (spring) | Feb 27 – Apr 29 |
| Onions | Start seeds indoors (spring) | Jan 16 – Feb 12 |
| Onions | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (spring) | Feb 9 – Mar 15 |
| Broccoli | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (fall) | Jul 15 – Jul 25 |
| Broccoli | Transplant outdoors (fall) | Aug 14 – Aug 25 |
| Cabbage | Start seeds indoors (spring) | Jan 30 – Feb 27 |
| Cabbage | Transplant outdoors (spring) | Feb 27 – Mar 30 |
| Cabbage | Start seeds indoors (fall) | Jul 5 – Aug 4 |
| Cabbage | Transplant outdoors (fall) | Aug 4 – Sep 4 |
| Leaf lettuce | Sow outdoors (spring) | Feb 27 – May 15 |
| Leaf lettuce | Sow outdoors (fall) | Aug 4 – Sep 20 |
| Spinach | Sow outdoors (spring) | Feb 20 – Apr 5 |
| Spinach | Sow outdoors (fall) | Aug 21 – Sep 25 |
| Radishes | Sow outdoors (spring) | Feb 27 – Apr 19 |
| Radishes | Sow outdoors (fall) | Aug 4 – Oct 5 |
| Kale | Sow outdoors (spring) | Mar 16 – Apr 5 |
| Kale | Sow outdoors (fall) | Jul 28 – Sep 4 |
| Carrots | Sow outdoors (spring) | Mar 30 – May 15 |
| Carrots | Sow outdoors (fall) | Jul 5 – Aug 20 |
| Garlic | Plant outdoors (fall) | Nov 4 – Dec 5 |
Where these dates come from
ZIP code 98535 is matched to the NOAA station Hoquiam Bowerman Ap, WA, 24.1 km away, at 12 ft elevation (8 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hoquiam Bowerman Ap, WA (used) | 12 ft | Mar 30 | Nov 14 |
| Humptulips Salmon Hatchery, WA | 140 ft | Apr 26 | Oct 22 |
| Aberdeen, WA | 10 ft | Mar 29 | Nov 15 |
| Grayland, WA | 10 ft | Mar 29 | Nov 7 |
Frost dates near Copalis Beach
- Copalis Crossing, WA 98536 · last Apr 26, first Oct 22
- Pacific Beach, WA 98571 · last Apr 26, first Oct 22
- Moclips, WA 98562 · last Apr 26, first Oct 22
- Ocean Shores, WA 98569 · last Mar 30, first Nov 14
- Westport, WA 98595 · last Mar 29, first Nov 7
- Hoquiam, WA 98550 · last Mar 30, first Nov 14
- Taholah, WA 98587 · last Apr 29, first Oct 17
- Humptulips, WA 98552 · last Apr 26, first Oct 22
Frequently asked questions
- When is the last frost in Copalis Beach, WA?
- For ZIP code 98535, the average last spring frost (32°F) is March 30, based on NOAA 1991-2020 climate normals for the Hoquiam Bowerman Ap, WA weather station. There is a 1-in-10 chance of a frost after April 25.
- When is the first frost in Copalis Beach, WA?
- The average first fall frost (32°F) is November 14. There is a 1-in-10 chance of frost by October 22, so tender plants are at risk from that point on.
- How long is the growing season in 98535?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 228 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.