Frost dates for 99356Roosevelt, WA
The average last spring frost in Roosevelt is June 2 and the average first fall frost is October 1, giving a typical growing season of about 119 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 2
- Average first fall frost
- Oct 1
- Growing season
- 119 days
Safer after Jun 22 (1-in-10 risk)
Possible by Sep 11 (1-in-10 risk)
Last frost typically in 214 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) | — | — | 81 days | 100% |
| Frost / freeze (32°F) | May 9 · Jun 2 · Jun 22 | Sep 11 · Oct 1 · Oct 16 | 119 days | 100% |
| Hard freeze (28°F) | Apr 17 · May 6 · May 31 | Oct 1 · Oct 17 · Nov 3 | 163 days | 100% |
Planting calendar for Roosevelt
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 | May 2 – Jul 8 |
| Tomatoes | Transplant outdoors | Jun 18 – Jun 11 |
| Peppers | Start seeds indoors | May 2 – Jun 2 |
| Peppers | Transplant outdoors | Jul 2 – Aug 2 |
| Eggplant | Start seeds indoors | May 19 – Jun 17 |
| Eggplant | Transplant outdoors | Jul 2 – Aug 2 |
| Cucumbers | Sow outdoors | Jul 2 – Jun 21 |
| Summer squash | Sow outdoors | Jun 18 – Aug 2 |
| Winter squash & pumpkins | Sow outdoors | Jul 2 – Aug 2 |
| Snap beans | Sow outdoors | Jun 18 – Jul 14 |
| Sweet corn | Sow outdoors | Jun 18 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jul 2 – Aug 2 |
| Okra | Sow outdoors | Jun 25 – Jul 18 |
| Peas | Sow outdoors (spring) | May 2 – Jun 17 |
| Potatoes | Plant outdoors (spring) | May 2 – Jul 2 |
| Onions | Start seeds indoors (spring) | Mar 21 – Apr 17 |
| Onions | Transplant outdoors (spring) | May 19 – Jun 17 |
| Broccoli | Start seeds indoors (spring) | Apr 14 – May 18 |
| Broccoli | Transplant outdoors (spring) | May 19 – Jun 17 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Apr 4 – May 2 |
| Cabbage | Transplant outdoors (spring) | May 2 – Jun 2 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | May 2 – Jul 18 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 25 – Jun 8 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | May 2 – Jun 22 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | May 19 – Jun 8 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | Jun 2 – Jul 18 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 99356 is matched to the NOAA station Satus Pass 2 Ssw, WA, 26.5 km away, at 2,585 ft elevation (482 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Satus Pass 2 Ssw, WA (used) | 2,585 ft | Jun 2 | Oct 1 |
| Bickleton, WA | 3,015 ft | May 16 | Oct 9 |
| Arlington, OR | 277 ft | Apr 6 | Oct 21 |
| Goldendale, WA | 1,640 ft | May 19 | Sep 25 |
Frost dates near Roosevelt
- Bickleton, WA 99322 · last May 16, first Oct 9
- Arlington, OR 97812 · last Apr 6, first Oct 21
- Rufus, OR 97050 · last Apr 11, first Oct 26
- Goldendale, WA 98620 · last May 19, first Sep 25
- Wasco, OR 97065 · last May 12, first Oct 4
- Mikkalo, OR 97861 · last May 12, first Oct 4
- Mabton, WA 98935 · last May 1, first Oct 6
- Moro, OR 97039 · last May 12, first Oct 4
Frequently asked questions
- When is the last frost in Roosevelt, WA?
- For ZIP code 99356, the average last spring frost (32°F) is June 2, based on NOAA 1991-2020 climate normals for the Satus Pass 2 Ssw, WA weather station. There is a 1-in-10 chance of a frost after June 22.
- When is the first frost in Roosevelt, WA?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 11, so tender plants are at risk from that point on.
- How long is the growing season in 99356?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 119 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.