Frost dates for 99326Connell, WA
The average last spring frost in Connell is April 30 and the average first fall frost is October 12, giving a typical growing season of about 165 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 30
- Average first fall frost
- Oct 12
- Growing season
- 165 days
Safer after May 15 (1-in-10 risk)
Possible by Sep 29 (1-in-10 risk)
Last frost typically in 179 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 30 · May 13 · May 31 | Sep 15 · Oct 1 · Oct 14 | 139 days | 100% |
| Frost / freeze (32°F) | Apr 12 · Apr 30 · May 15 | Sep 29 · Oct 12 · Oct 26 | 165 days | 100% |
| Hard freeze (28°F) | Mar 20 · Apr 10 · May 1 | Oct 8 · Oct 24 · Nov 10 | 197 days | 100% |
Planting calendar for Connell
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 30 – Jun 5 |
| Tomatoes | Transplant outdoors | May 16 – Jun 22 |
| Peppers | Start seeds indoors | Mar 30 – Apr 30 |
| Peppers | Transplant outdoors | May 30 – Jun 30 |
| Eggplant | Start seeds indoors | Apr 16 – May 15 |
| Eggplant | Transplant outdoors | May 30 – Jun 30 |
| Cucumbers | Sow outdoors | May 30 – Jul 2 |
| Summer squash | Sow outdoors | May 16 – Jun 30 |
| Winter squash & pumpkins | Sow outdoors | May 30 – Jun 30 |
| Snap beans | Sow outdoors | May 16 – Jul 25 |
| Sweet corn | Sow outdoors | May 16 – Jun 22 |
| Watermelon & cantaloupe | Sow outdoors | May 30 – Jun 30 |
| Okra | Sow outdoors | May 23 – Jun 15 |
| Peas | Sow outdoors (spring) | Mar 30 – May 15 |
| Potatoes | Plant outdoors (spring) | Mar 30 – May 30 |
| Onions | Start seeds indoors (spring) | Feb 16 – Mar 15 |
| Onions | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (spring) | Mar 12 – Apr 15 |
| Broccoli | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (fall) | Jun 12 – Jun 22 |
| Broccoli | Transplant outdoors (fall) | Jul 12 – Jul 23 |
| Cabbage | Start seeds indoors (spring) | Mar 2 – Mar 30 |
| Cabbage | Transplant outdoors (spring) | Mar 30 – Apr 30 |
| Cabbage | Start seeds indoors (fall) | Jun 2 – Jul 2 |
| Cabbage | Transplant outdoors (fall) | Jul 2 – Aug 2 |
| Leaf lettuce | Sow outdoors (spring) | Mar 30 – Jun 15 |
| Leaf lettuce | Sow outdoors (fall) | Jul 2 – Aug 18 |
| Spinach | Sow outdoors (spring) | Mar 23 – May 6 |
| Spinach | Sow outdoors (fall) | Jul 19 – Aug 23 |
| Radishes | Sow outdoors (spring) | Mar 30 – May 20 |
| Radishes | Sow outdoors (fall) | Jul 2 – Sep 2 |
| Kale | Sow outdoors (spring) | Apr 16 – May 6 |
| Kale | Sow outdoors (fall) | Jun 25 – Aug 2 |
| Carrots | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Carrots | Sow outdoors (fall) | Jun 2 – Jul 18 |
| Garlic | Plant outdoors (fall) | Oct 2 – Nov 2 |
Where these dates come from
ZIP code 99326 is matched to the NOAA station Connell 1 W, WA, 2.2 km away, at 1,020 ft elevation (141 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Connell 1 W, WA (used) | 1,020 ft | Apr 30 | Oct 12 |
| Hatton 9 Se, WA | 1,505 ft | Apr 25 | Oct 15 |
| Sagemoor, WA | 595 ft | Apr 30 | Oct 13 |
| Eltopia 8 Wsw, WA | 700 ft | Apr 21 | Oct 22 |
Frost dates near Connell
- Othello, WA 99344 · last Apr 25, first Oct 15
- Mesa, WA 99343 · last Apr 21, first Oct 22
- Kahlotus, WA 99335 · last Apr 25, first Oct 15
- Eltopia, WA 99330 · last Apr 21, first Oct 22
- Lind, WA 99341 · last May 7, first Oct 4
- Warden, WA 98857 · last Apr 27, first Oct 8
- Washtucna, WA 99371 · last May 13, first Sep 26
- Prescott, WA 99348 · last Apr 28, first Oct 13
Frequently asked questions
- When is the last frost in Connell, WA?
- For ZIP code 99326, the average last spring frost (32°F) is April 30, based on NOAA 1991-2020 climate normals for the Connell 1 W, WA weather station. There is a 1-in-10 chance of a frost after May 15.
- When is the first frost in Connell, WA?
- The average first fall frost (32°F) is October 12. There is a 1-in-10 chance of frost by September 29, so tender plants are at risk from that point on.
- How long is the growing season in 99326?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 165 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.