Frost dates for 98813Bridgeport, WA
The average last spring frost in Bridgeport is April 26 and the average first fall frost is October 11, giving a typical growing season of about 167 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 26
- Average first fall frost
- Oct 11
- Growing season
- 167 days
Safer after May 13 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 183 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 26 · May 10 · Jun 1 | Sep 18 · Oct 1 · Oct 15 | 142 days | 100% |
| Frost / freeze (32°F) | Apr 9 · Apr 26 · May 13 | Sep 30 · Oct 11 · Oct 27 | 167 days | 100% |
| Hard freeze (28°F) | Mar 17 · Apr 9 · May 2 | Oct 7 · Oct 23 · Nov 6 | 196 days | 100% |
Planting calendar for Bridgeport
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 26 – Jun 1 |
| Tomatoes | Transplant outdoors | May 12 – Jun 21 |
| Peppers | Start seeds indoors | Mar 26 – Apr 26 |
| Peppers | Transplant outdoors | May 26 – Jun 26 |
| Eggplant | Start seeds indoors | Apr 12 – May 11 |
| Eggplant | Transplant outdoors | May 26 – Jun 26 |
| Cucumbers | Sow outdoors | May 26 – Jul 1 |
| Summer squash | Sow outdoors | May 12 – Jun 26 |
| Winter squash & pumpkins | Sow outdoors | May 26 – Jun 26 |
| Snap beans | Sow outdoors | May 12 – Jul 24 |
| Sweet corn | Sow outdoors | May 12 – Jun 21 |
| Watermelon & cantaloupe | Sow outdoors | May 26 – Jun 26 |
| Okra | Sow outdoors | May 19 – Jun 11 |
| Peas | Sow outdoors (spring) | Mar 26 – May 11 |
| Potatoes | Plant outdoors (spring) | Mar 26 – May 26 |
| Onions | Start seeds indoors (spring) | Feb 12 – Mar 11 |
| Onions | Transplant outdoors (spring) | Apr 12 – May 11 |
| Broccoli | Start seeds indoors (spring) | Mar 8 – Apr 11 |
| Broccoli | Transplant outdoors (spring) | Apr 12 – May 11 |
| Broccoli | Start seeds indoors (fall) | Jun 11 – Jun 21 |
| Broccoli | Transplant outdoors (fall) | Jul 11 – Jul 22 |
| Cabbage | Start seeds indoors (spring) | Feb 26 – Mar 26 |
| Cabbage | Transplant outdoors (spring) | Mar 26 – Apr 26 |
| Cabbage | Start seeds indoors (fall) | Jun 1 – Jul 1 |
| Cabbage | Transplant outdoors (fall) | Jul 1 – Aug 1 |
| Leaf lettuce | Sow outdoors (spring) | Mar 26 – Jun 11 |
| Leaf lettuce | Sow outdoors (fall) | Jul 1 – Aug 17 |
| Spinach | Sow outdoors (spring) | Mar 19 – May 2 |
| Spinach | Sow outdoors (fall) | Jul 18 – Aug 22 |
| Radishes | Sow outdoors (spring) | Mar 26 – May 16 |
| Radishes | Sow outdoors (fall) | Jul 1 – Sep 1 |
| Kale | Sow outdoors (spring) | Apr 12 – May 2 |
| Kale | Sow outdoors (fall) | Jun 24 – Aug 1 |
| Carrots | Sow outdoors (spring) | Apr 26 – Jun 11 |
| Carrots | Sow outdoors (fall) | Jun 1 – Jul 17 |
| Garlic | Plant outdoors (fall) | Oct 1 – Nov 1 |
Where these dates come from
ZIP code 98813 is matched to the NOAA station Chief Joseph Dam, WA, 2.1 km away, at 834 ft elevation (19 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chief Joseph Dam, WA (used) | 834 ft | Apr 26 | Oct 11 |
| Methow 2 S, WA | 1,135 ft | Apr 21 | Oct 15 |
| Chelan, WA | 1,194 ft | Apr 17 | Oct 22 |
| Waterville, WA | 2,664 ft | May 14 | Oct 1 |
Frost dates near Bridgeport
- Brewster, WA 98812 · last Apr 21, first Oct 15
- Pateros, WA 98846 · last May 14, first Oct 1
- Mansfield, WA 98830 · last May 2, first Oct 12
- Malott, WA 98829 · last Apr 30, first Oct 7
- Chelan, WA 98816 · last Apr 17, first Oct 22
- Chelan Falls, WA 98817 · last Apr 17, first Oct 22
- Methow, WA 98834 · last May 25, first Sep 19
- Manson, WA 98831 · last Apr 17, first Oct 22
Frequently asked questions
- When is the last frost in Bridgeport, WA?
- For ZIP code 98813, the average last spring frost (32°F) is April 26, based on NOAA 1991-2020 climate normals for the Chief Joseph Dam, WA weather station. There is a 1-in-10 chance of a frost after May 13.
- When is the first frost in Bridgeport, WA?
- The average first fall frost (32°F) is October 11. There is a 1-in-10 chance of frost by September 30, so tender plants are at risk from that point on.
- How long is the growing season in 98813?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 167 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.