Bremerton, WA planting calendar
- USDA zone
- 8b15 to 20 °F
- Last frost
- Mar 29avg, 32°F
- First frost
- Nov 14avg, 32°F
- Growing season
- 227days
Bremerton, Washington is in USDA plant hardiness zone 8b. Its average last spring frost is around March 29 and the first fall frost around November 14, giving a growing season of about 227 days (NOAA 1991–2020 normals, 32°F, median). Start tender crops like tomatoes and peppers indoors weeks before the last frost and set them out afterward; sow hardy crops such as peas, spinach, and lettuce before it. The planner below turns those frost dates into a printable per-crop planting calendar.
Bremerton planting calendar
Each crop's windows are counted from Bremerton's average frost dates. hatched = start seeds indoors, solid green = plant out, teal = a fall sowing, and the terracotta dot marks the estimated first harvest. Ranges are extension-guide planning guidance, not guarantees.
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting |
|---|---|---|---|---|---|
| Tomato | Tender | Feb 1 – Feb 15 | Apr 5 – Apr 12 | Jun 4 – Jun 24 | — |
| Pepper | Very tender | Jan 18 – Feb 1 | Apr 12 – Apr 19 | Jun 11 – Jul 11 | — |
| Cucumber | Tender | Mar 1 – Mar 8 | Apr 5 – Apr 12 | May 25 – Jun 14 | — |
| Summer squash / zucchini | Tender | — | Apr 5 – Apr 12 | May 20 – Jun 4 | — |
| Bush bean | Tender | — | Apr 5 – Apr 12 | May 25 – Jun 4 | Sep 15 – Sep 25 |
| Sweet corn | Tender | — | Mar 29 – Apr 12 | May 28 – Jun 27 | — |
| Basil | Very tender | Feb 15 – Mar 1 | Apr 5 – Apr 12 | May 5 – May 20 | — |
| Lettuce | Half-hardy | Feb 15 – Mar 1 | Mar 1 – Mar 15 | Apr 15 – Apr 30 | Sep 1 – Sep 16 |
| Pea | Hardy | — | Feb 15 – Mar 1 | Apr 11 – Apr 26 | Aug 22 – Sep 6 |
| Spinach | Hardy | — | Feb 15 – Mar 1 | Mar 27 – Apr 6 | Sep 11 – Sep 21 |
| Carrot | Half-hardy | — | Mar 8 – Mar 15 | May 7 – May 27 | Aug 12 – Sep 1 |
| Broccoli | Half-hardy | Feb 1 – Feb 15 | Mar 1 – Mar 15 | Apr 25 – May 15 | Aug 17 – Sep 6 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
Frost & freeze dates
From NOAA's 1991–2020 Climate Normals at station USC00450872. The median (p50) is the average date; the 90%-safe column is the date the freeze has passed in about 9 years out of 10 (p10 for spring, p90 for fall) — the conservative date to plant after or harvest before.
| Threshold | Last spring — avg | Last spring — 90%-safe | First fall — avg | First fall — 90%-safe | Season (days) |
|---|---|---|---|---|---|
| 36°F | Apr 25 | May 13 | Oct 27 | Nov 13 | 183 |
| 32°F (freeze) | Mar 29 | Apr 24 | Nov 14 | Dec 1 | 227 |
| 28°F | Feb 27 | Mar 27 | Nov 30 | Dec 24 | 273 |
| 24°F | Jan 26 | Feb 24 | Dec 15 | Feb 1 | 330 |
32°F is the standard "freeze" line that damages tender crops; lighter 36°F frost can nip the most cold-sensitive plants, while hardy crops shrug off light frost down toward 28°F. Use the threshold that matches what you are protecting.
Growing degree days
Growing degree days (GDD) accumulate warmth above a base temperature over the year — a better predictor of crop development than the calendar alone. Warm-season crops need a long, warm GDD total; a short, cool GDD total favors greens and brassicas.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 2,058 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 4,658 | cool-season crops (brassicas, greens) |
Hardiness zone 8b
Bremerton sits in USDA plant hardiness zone 8b on the 2023 map — meaning its average annual extreme minimum winter temperature is about 15 to 20 °F. That number tells you which perennials, shrubs, and trees reliably survive an average winter here; it does not set your planting dates, which come from the frost calendar above.
Explore more places in zone 8b, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Bremerton?
- Bremerton, Washington is in USDA plant hardiness zone 8b on the 2023 map (average annual extreme minimum temperature 15 to 20 °F) — from the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. See the methodology page for sources.
- When is the last frost in Bremerton?
- The average (median) last spring frost at 32°F is around March 29, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as April 24, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Bremerton?
- The average first fall frost at 32°F is around November 14. That leaves a growing season of about 227 days between the average last spring and first fall frosts.
- When should I start tomatoes in Bremerton?
- Start tomato seeds indoors about Feb 1 – Feb 15 and transplant them outside about Apr 5 – Apr 12, once the danger of frost has passed. Estimated first harvest is around Jun 4 – Jun 24.
- How long is the growing season in Bremerton?
- About 227 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~March 29) and the average first fall frost (~November 14). Cold-hardy crops extend usable time at both ends; frost-tender crops fit inside it.
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020 for station USC00450872 (Bremerton, 3.4 km away). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. Planting windows are computed by counting from the average last and first frost using per-crop offsets synthesized from U.S. Cooperative Extension guides — the full method and citations are on the methodology page.