Frost dates for 98650Trout Lake, WA
The average last spring frost in Trout Lake is May 18 and the average first fall frost is September 25, giving a typical growing season of about 125 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 18
- Average first fall frost
- Sep 25
- Growing season
- 125 days
Safer after Jun 12 (1-in-10 risk)
Possible by Sep 4 (1-in-10 risk)
Last frost typically in 199 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) | May 23 · Jun 13 · Jul 2 | Aug 20 · Sep 7 · Sep 25 | 84 days | 100% |
| Frost / freeze (32°F) | May 1 · May 18 · Jun 12 | Sep 4 · Sep 25 · Oct 10 | 125 days | 100% |
| Hard freeze (28°F) | Apr 11 · Apr 29 · May 16 | Sep 21 · Oct 9 · Nov 1 | 161 days | 100% |
Planting calendar for Trout Lake
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 | Apr 17 – Jun 23 |
| Tomatoes | Transplant outdoors | Jun 3 – Jun 5 |
| Peppers | Start seeds indoors | Apr 17 – May 18 |
| Peppers | Transplant outdoors | Jun 17 – Jul 18 |
| Eggplant | Start seeds indoors | May 4 – Jun 2 |
| Eggplant | Transplant outdoors | Jun 17 – Jul 18 |
| Cucumbers | Sow outdoors | Jun 17 – Jun 15 |
| Summer squash | Sow outdoors | Jun 3 – Jul 18 |
| Winter squash & pumpkins | Sow outdoors | Jun 17 – Jul 18 |
| Snap beans | Sow outdoors | Jun 3 – Jul 8 |
| Sweet corn | Sow outdoors | Jun 3 – Jun 5 |
| Watermelon & cantaloupe | Sow outdoors | Jun 17 – Jul 18 |
| Okra | Sow outdoors | Jun 10 – Jul 3 |
| Peas | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Potatoes | Plant outdoors (spring) | Apr 17 – Jun 17 |
| Onions | Start seeds indoors (spring) | Mar 6 – Apr 2 |
| Onions | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (spring) | Mar 30 – May 3 |
| Broccoli | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (fall) | May 26 – Jun 5 |
| Broccoli | Transplant outdoors (fall) | Jun 25 – Jul 6 |
| Cabbage | Start seeds indoors (spring) | Mar 20 – Apr 17 |
| Cabbage | Transplant outdoors (spring) | Apr 17 – May 18 |
| Cabbage | Start seeds indoors (fall) | May 16 – Jun 15 |
| Cabbage | Transplant outdoors (fall) | Jun 15 – Jul 16 |
| Leaf lettuce | Sow outdoors (spring) | Apr 17 – Jul 3 |
| Leaf lettuce | Sow outdoors (fall) | Jun 15 – Aug 1 |
| Spinach | Sow outdoors (spring) | Apr 10 – May 24 |
| Spinach | Sow outdoors (fall) | Jul 2 – Aug 6 |
| Radishes | Sow outdoors (spring) | Apr 17 – Jun 7 |
| Radishes | Sow outdoors (fall) | Jun 15 – Aug 16 |
| Kale | Sow outdoors (spring) | May 4 – May 24 |
| Kale | Sow outdoors (fall) | Jun 8 – Jul 16 |
| Carrots | Sow outdoors (spring) | May 18 – Jul 3 |
| Carrots | Sow outdoors (fall) | May 16 – Jul 1 |
| Garlic | Plant outdoors (fall) | Sep 15 – Oct 16 |
Where these dates come from
ZIP code 98650 is matched to the NOAA station Mt Adams Rs, WA, 2.6 km away, at 1,950 ft elevation (57 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mt Adams Rs, WA (used) | 1,950 ft | May 18 | Sep 25 |
| Glenwood #2, WA | 1,902 ft | — | — |
| Snowden, WA | 2,415 ft | May 12 | Oct 11 |
| Hood Rvr Exp Stn, OR | 500 ft | Apr 20 | Oct 13 |
Frost dates near Trout Lake
- Glenwood, WA 98619 · last —, first —
- Husum, WA 98623 · last Apr 20, first Oct 13
- Appleton, WA 98602 · last May 12, first Oct 11
- Bingen, WA 98605 · last May 2, first Oct 9
- White Salmon, WA 98672 · last Apr 20, first Oct 13
- Underwood, WA 98651 · last May 13, first Oct 3
- Wahkiacus, WA 98670 · last May 18, first Sep 25
- Lyle, WA 98635 · last May 13, first Oct 3
Frequently asked questions
- When is the last frost in Trout Lake, WA?
- For ZIP code 98650, the average last spring frost (32°F) is May 18, based on NOAA 1991-2020 climate normals for the Mt Adams Rs, WA weather station. There is a 1-in-10 chance of a frost after June 12.
- When is the first frost in Trout Lake, WA?
- The average first fall frost (32°F) is September 25. There is a 1-in-10 chance of frost by September 4, so tender plants are at risk from that point on.
- How long is the growing season in 98650?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 125 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.