Frost dates for 98324Carlsborg, WA
The average last spring frost in Carlsborg is April 21 and the average first fall frost is October 20, giving a typical growing season of about 181 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 21
- Average first fall frost
- Oct 20
- Growing season
- 181 days
Safer after May 7 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 178 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 24 · May 7 · May 26 | Sep 20 · Oct 3 · Oct 17 | 146 days | 100% |
| Frost / freeze (32°F) | Apr 3 · Apr 21 · May 7 | Oct 3 · Oct 20 · Nov 3 | 181 days | 100% |
| Hard freeze (28°F) | Mar 2 · Mar 28 · Apr 17 | Oct 19 · Nov 7 · Dec 1 | 225 days | 100% |
Planting calendar for Carlsborg
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 21 – May 27 |
| Tomatoes | Transplant outdoors | May 7 – Jun 30 |
| Peppers | Start seeds indoors | Mar 21 – Apr 21 |
| Peppers | Transplant outdoors | May 21 – Jun 21 |
| Eggplant | Start seeds indoors | Apr 7 – May 6 |
| Eggplant | Transplant outdoors | May 21 – Jun 21 |
| Cucumbers | Sow outdoors | May 21 – Jul 10 |
| Summer squash | Sow outdoors | May 7 – Jun 21 |
| Winter squash & pumpkins | Sow outdoors | May 21 – Jun 21 |
| Snap beans | Sow outdoors | May 7 – Aug 2 |
| Sweet corn | Sow outdoors | May 7 – Jun 30 |
| Watermelon & cantaloupe | Sow outdoors | May 21 – Jun 21 |
| Okra | Sow outdoors | May 14 – Jun 6 |
| Peas | Sow outdoors (spring) | Mar 21 – May 6 |
| Potatoes | Plant outdoors (spring) | Mar 21 – May 21 |
| Onions | Start seeds indoors (spring) | Feb 7 – Mar 6 |
| Onions | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (spring) | Mar 3 – Apr 6 |
| Broccoli | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (fall) | Jun 20 – Jun 30 |
| Broccoli | Transplant outdoors (fall) | Jul 20 – Jul 31 |
| Cabbage | Start seeds indoors (spring) | Feb 21 – Mar 21 |
| Cabbage | Transplant outdoors (spring) | Mar 21 – Apr 21 |
| Cabbage | Start seeds indoors (fall) | Jun 10 – Jul 10 |
| Cabbage | Transplant outdoors (fall) | Jul 10 – Aug 10 |
| Leaf lettuce | Sow outdoors (spring) | Mar 21 – Jun 6 |
| Leaf lettuce | Sow outdoors (fall) | Jul 10 – Aug 26 |
| Spinach | Sow outdoors (spring) | Mar 14 – Apr 27 |
| Spinach | Sow outdoors (fall) | Jul 27 – Aug 31 |
| Radishes | Sow outdoors (spring) | Mar 21 – May 11 |
| Radishes | Sow outdoors (fall) | Jul 10 – Sep 10 |
| Kale | Sow outdoors (spring) | Apr 7 – Apr 27 |
| Kale | Sow outdoors (fall) | Jul 3 – Aug 10 |
| Carrots | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Carrots | Sow outdoors (fall) | Jun 10 – Jul 26 |
| Garlic | Plant outdoors (fall) | Oct 10 – Nov 10 |
Where these dates come from
ZIP code 98324 is matched to the NOAA station Sequim 2 E, WA, 8.1 km away, at 50 ft elevation (131 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Sequim 2 E, WA (used) | 50 ft | Apr 21 | Oct 20 |
| Port Angeles, WA | 90 ft | Mar 12 | Nov 19 |
| Port Angeles Intl Ap, WA | 288 ft | Apr 8 | Oct 31 |
| Port Townsend, WA | 100 ft | Mar 1 | Nov 28 |
Frost dates near Carlsborg
- Sequim, WA 98382 · last Apr 21, first Oct 20
- Port Angeles, WA 98362 · last Apr 8, first Oct 31
- Port Townsend, WA 98368 · last Mar 1, first Nov 28
- Port Hadlock, WA 98339 · last Mar 1, first Nov 28
- Chimacum, WA 98325 · last Mar 1, first Nov 28
- Nordland, WA 98358 · last Mar 1, first Nov 28
- Quilcene, WA 98376 · last Apr 11, first Oct 28
- Coupeville, WA 98239 · last Mar 17, first Nov 11
Frequently asked questions
- When is the last frost in Carlsborg, WA?
- For ZIP code 98324, the average last spring frost (32°F) is April 21, based on NOAA 1991-2020 climate normals for the Sequim 2 E, WA weather station. There is a 1-in-10 chance of a frost after May 7.
- When is the first frost in Carlsborg, WA?
- The average first fall frost (32°F) is October 20. There is a 1-in-10 chance of frost by October 3, so tender plants are at risk from that point on.
- How long is the growing season in 98324?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 181 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.