Frost dates for 98609Carrolls, WA
The average last spring frost in Carrolls is April 8 and the average first fall frost is November 5, giving a typical growing season of about 210 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 8
- Average first fall frost
- Nov 5
- Growing season
- 210 days
Safer after May 2 (1-in-10 risk)
Possible by Oct 17 (1-in-10 risk)
First frost typically in 6 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 15 · May 3 · May 24 | Oct 2 · Oct 21 · Nov 10 | 169 days | 100% |
| Frost / freeze (32°F) | Mar 11 · Apr 8 · May 2 | Oct 17 · Nov 5 · Nov 28 | 210 days | 100% |
| Hard freeze (28°F) | Feb 6 · Mar 6 · Apr 4 | Oct 31 · Nov 24 · Dec 20 | 262 days | 100% |
Planting calendar for Carrolls
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 8 – May 14 |
| Tomatoes | Transplant outdoors | Apr 24 – Jul 16 |
| Peppers | Start seeds indoors | Mar 8 – Apr 8 |
| Peppers | Transplant outdoors | May 8 – Jun 8 |
| Eggplant | Start seeds indoors | Mar 25 – Apr 23 |
| Eggplant | Transplant outdoors | May 8 – Jun 8 |
| Cucumbers | Sow outdoors | May 8 – Jul 26 |
| Summer squash | Sow outdoors | Apr 24 – Jun 8 |
| Winter squash & pumpkins | Sow outdoors | May 8 – Jun 8 |
| Snap beans | Sow outdoors | Apr 24 – Aug 18 |
| Sweet corn | Sow outdoors | Apr 24 – Jul 16 |
| Watermelon & cantaloupe | Sow outdoors | May 8 – Jun 8 |
| Okra | Sow outdoors | May 1 – May 24 |
| Peas | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Potatoes | Plant outdoors (spring) | Mar 8 – May 8 |
| Onions | Start seeds indoors (spring) | Jan 25 – Feb 21 |
| Onions | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (spring) | Feb 18 – Mar 24 |
| Broccoli | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (fall) | Jul 6 – Jul 16 |
| Broccoli | Transplant outdoors (fall) | Aug 5 – Aug 16 |
| Cabbage | Start seeds indoors (spring) | Feb 8 – Mar 8 |
| Cabbage | Transplant outdoors (spring) | Mar 8 – Apr 8 |
| Cabbage | Start seeds indoors (fall) | Jun 26 – Jul 26 |
| Cabbage | Transplant outdoors (fall) | Jul 26 – Aug 26 |
| Leaf lettuce | Sow outdoors (spring) | Mar 8 – May 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 26 – Sep 11 |
| Spinach | Sow outdoors (spring) | Mar 1 – Apr 14 |
| Spinach | Sow outdoors (fall) | Aug 12 – Sep 16 |
| Radishes | Sow outdoors (spring) | Mar 8 – Apr 28 |
| Radishes | Sow outdoors (fall) | Jul 26 – Sep 26 |
| Kale | Sow outdoors (spring) | Mar 25 – Apr 14 |
| Kale | Sow outdoors (fall) | Jul 19 – Aug 26 |
| Carrots | Sow outdoors (spring) | Apr 8 – May 24 |
| Carrots | Sow outdoors (fall) | Jun 26 – Aug 11 |
| Garlic | Plant outdoors (fall) | Oct 26 – Nov 26 |
Where these dates come from
ZIP code 98609 is matched to the NOAA station Longview, WA, 9.7 km away, at 12 ft elevation (60 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Longview, WA (used) | 12 ft | Apr 8 | Nov 5 |
| Saint Helens Rfd, OR | 269 ft | Apr 18 | Nov 7 |
| Clatskanie, OR | 22 ft | Apr 24 | Oct 24 |
| Scappoose Ind Ap, OR | 55 ft | Apr 10 | Nov 2 |
Frost dates near Carrolls
- Kalama, WA 98625 · last May 8, first Oct 1
- Rainier, OR 97048 · last May 8, first Oct 1
- Kelso, WA 98626 · last Apr 8, first Nov 5
- Longview, WA 98632 · last Apr 8, first Nov 5
- Deer Island, OR 97054 · last Apr 18, first Nov 7
- Columbia City, OR 97018 · last Apr 10, first Nov 2
- Woodland, WA 98674 · last Apr 10, first Nov 2
- Castle Rock, WA 98611 · last Apr 8, first Nov 5
Frequently asked questions
- When is the last frost in Carrolls, WA?
- For ZIP code 98609, the average last spring frost (32°F) is April 8, based on NOAA 1991-2020 climate normals for the Longview, WA weather station. There is a 1-in-10 chance of a frost after May 2.
- When is the first frost in Carrolls, WA?
- The average first fall frost (32°F) is November 5. There is a 1-in-10 chance of frost by October 17, so tender plants are at risk from that point on.
- How long is the growing season in 98609?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 210 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.