Frost Dates for Bremerton, WA 98337
Bremerton has 5 ZIP codes. The Bremerton, WA frost page lists all of them with their dates.
Last spring frost April 4 · First fall frost November 16 · 226 frost-free days · USDA Zone 9a
Frost probability for 98337
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 23 | April 4 | March 16 |
| Fall (first frost) | October 28 | November 16 | December 3 |
Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (3.7 km away); the 50% date is the median year.
Month by month in Bremerton
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start peppers and eggplant indoors 8–10 weeks before your last frost (around April 4). Start tomatoes about two weeks later, 6–8 weeks before last frost. |
| March | Start herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable. |
| April | Last frost around April 4. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings. |
| May | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| June | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| July | Harvest regularly to encourage production. Monitor for pests and disease. |
| August | Midsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall. |
| September | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| October | First fall frost approaching (around November 16). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| November | First frost around November 16. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season. |
| December | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
What grows in a 226-day season
Frequently Asked Questions
What is the last frost date for Bremerton, WA (ZIP 98337)?
The median last spring frost date for Bremerton, WA (ZIP code 98337) is around April 4. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.
What is the first fall frost date in Bremerton, WA?
The median first fall frost date for Bremerton, WA is around November 16. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.
How long is the growing season in Bremerton, WA?
The frost-free growing season in Bremerton is about 226 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.
What USDA hardiness zone is Bremerton, WA?
Based on frost date patterns, Bremerton falls approximately in 9a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.
When should I start tomatoes indoors in Bremerton, WA?
Start tomato seeds indoors 6–8 weeks before your last frost date (around April 4). For Bremerton, that's roughly February 8 to February 22. Transplant outdoors 1–2 weeks after your last frost.
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