Frost dates for 98370Poulsbo, WA
The average last spring frost in Poulsbo is March 29 and the average first fall frost is November 14, giving a typical growing season of about 227 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 29
- Average first fall frost
- Nov 14
- Growing season
- 227 days
Safer after Apr 24 (1-in-10 risk)
Possible by Oct 26 (1-in-10 risk)
First frost typically in 13 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 7 · Apr 25 · May 13 | Oct 4 · Oct 27 · Nov 13 | 183 days | 100% |
| Frost / freeze (32°F) | Mar 5 · Mar 29 · Apr 24 | Oct 26 · Nov 14 · Dec 1 | 227 days | 100% |
| Hard freeze (28°F) | Jan 24 · Feb 27 · Mar 27 | Nov 10 · Nov 30 · Dec 24 | 273 days | 100% |
Planting calendar for Poulsbo
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 | Feb 26 – May 4 |
| Tomatoes | Transplant outdoors | Apr 14 – Jul 25 |
| Peppers | Start seeds indoors | Feb 26 – Mar 29 |
| Peppers | Transplant outdoors | Apr 28 – May 29 |
| Eggplant | Start seeds indoors | Mar 15 – Apr 13 |
| Eggplant | Transplant outdoors | Apr 28 – May 29 |
| Cucumbers | Sow outdoors | Apr 28 – Aug 4 |
| Summer squash | Sow outdoors | Apr 14 – May 29 |
| Winter squash & pumpkins | Sow outdoors | Apr 28 – May 29 |
| Snap beans | Sow outdoors | Apr 14 – Aug 27 |
| Sweet corn | Sow outdoors | Apr 14 – Jul 25 |
| Watermelon & cantaloupe | Sow outdoors | Apr 28 – May 29 |
| Okra | Sow outdoors | Apr 21 – May 14 |
| Peas | Sow outdoors (spring) | Feb 26 – Apr 13 |
| Potatoes | Plant outdoors (spring) | Feb 26 – Apr 28 |
| Onions | Start seeds indoors (spring) | Jan 15 – Feb 11 |
| Onions | Transplant outdoors (spring) | Mar 15 – Apr 13 |
| Broccoli | Start seeds indoors (spring) | Feb 8 – Mar 14 |
| Broccoli | Transplant outdoors (spring) | Mar 15 – Apr 13 |
| Broccoli | Start seeds indoors (fall) | Jul 15 – Jul 25 |
| Broccoli | Transplant outdoors (fall) | Aug 14 – Aug 25 |
| Cabbage | Start seeds indoors (spring) | Jan 29 – Feb 26 |
| Cabbage | Transplant outdoors (spring) | Feb 26 – Mar 29 |
| Cabbage | Start seeds indoors (fall) | Jul 5 – Aug 4 |
| Cabbage | Transplant outdoors (fall) | Aug 4 – Sep 4 |
| Leaf lettuce | Sow outdoors (spring) | Feb 26 – May 14 |
| Leaf lettuce | Sow outdoors (fall) | Aug 4 – Sep 20 |
| Spinach | Sow outdoors (spring) | Feb 19 – Apr 4 |
| Spinach | Sow outdoors (fall) | Aug 21 – Sep 25 |
| Radishes | Sow outdoors (spring) | Feb 26 – Apr 18 |
| Radishes | Sow outdoors (fall) | Aug 4 – Oct 5 |
| Kale | Sow outdoors (spring) | Mar 15 – Apr 4 |
| Kale | Sow outdoors (fall) | Jul 28 – Sep 4 |
| Carrots | Sow outdoors (spring) | Mar 29 – May 14 |
| Carrots | Sow outdoors (fall) | Jul 5 – Aug 20 |
| Garlic | Plant outdoors (fall) | Nov 4 – Dec 5 |
Where these dates come from
ZIP code 98370 is matched to the NOAA station Bremerton, WA, 19.7 km away, at 110 ft elevation (195 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bremerton, WA (used) | 110 ft | Mar 29 | Nov 14 |
| Quilcene 2 Sw, WA | 123 ft | Apr 11 | Oct 28 |
| Seattle Sand Pt Wsfo, WA | 60 ft | Mar 8 | Nov 23 |
| Everett Snohomish Ap, WA | 606 ft | Mar 9 | Nov 17 |
Frost dates near Poulsbo
- Keyport, WA 98345 · last Mar 29, first Nov 14
- Suquamish, WA 98392 · last Mar 29, first Nov 14
- Rollingbay, WA 98061 · last Mar 29, first Nov 14
- Indianola, WA 98342 · last Mar 8, first Nov 23
- Silverdale, WA 98315 · last Mar 29, first Nov 14
- Kingston, WA 98346 · last Mar 8, first Nov 23
- Bainbridge Island, WA 98110 · last Mar 29, first Nov 14
- Bremerton, WA 98311 · last Mar 29, first Nov 14
Frequently asked questions
- When is the last frost in Poulsbo, WA?
- For ZIP code 98370, the average last spring frost (32°F) is March 29, based on NOAA 1991-2020 climate normals for the Bremerton, WA weather station. There is a 1-in-10 chance of a frost after April 24.
- When is the first frost in Poulsbo, WA?
- The average first fall frost (32°F) is November 14. There is a 1-in-10 chance of frost by October 26, so tender plants are at risk from that point on.
- How long is the growing season in 98370?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 227 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.