When is the last frost in Bremerton, WA?

The average last spring frost (50% probability of 32°F) in Bremerton is around March 29, based on NOAA/NCEI 1991–2020 normals at the Bremerton, WA station (2.1 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Bremerton?

The average first fall frost in Bremerton, WA is around November 14, giving roughly a 227-day frost-free growing season.

What planting zone is Bremerton, WA?

Bremerton is in USDA plant hardiness zone 9a (average annual extreme minimum temperature 20 to 25°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Bremerton?

In Bremerton, WA the warmest month is August (avg high 77.3°F) and the coldest is December (avg low 35°F). It averages about 56.9″ of precipitation a year and 3″ of snow.

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Bremerton, WA Planting Calendar & Frost Dates

USDA hardiness zone 9a · ZIP 98337 · elevation 34′ · NOAA & USDA data

Bremerton is in USDA hardiness zone 9a (winters can dip to 20 to 25°F), with a growing season of about 227 days between the average last spring frost (March 29) and first fall frost (November 14). The warmest month is August (avg high 77.3°F); the coldest is December (avg low 35°F). It averages 56.9″ of precipitation a year and 3″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 20 to 25°F

Last spring frost

March 29

avg (50% prob, 32°F)

First fall frost

November 14

avg (50% prob, 32°F)

Growing season

227 days

frost-free window

Warmest month

August

avg high 77.3°F

Month-by-month typical weather in Bremerton

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Bremerton, WA (2.1 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	46.6	35.6	41.1	9.3	0.6
February	49.4	35.1	42.3	5.8	0.7
March	53.7	37.7	45.7	6.4	0.1
April	59	41	50	3.9	0
May	65.8	46.5	56.2	2.4	0
June	70.2	51.1	60.7	1.6	0
July	76.5	54.6	65.6	0.8	0
August	77.3	55.1	66.2	1.1	0
September	71.9	51.1	61.5	1.8	0
October	60.6	44.7	52.6	5.1	0
November	51.2	38.7	45	8.8	0.3
December	45.6	35	40.3	9.9	1.3

What to plant when in Bremerton

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 15 · Transplant out: April 5
Peppers	warm	Start seeds indoors: February 1 · Transplant out: April 12
Cucumbers	warm	Direct sow: April 5
Zucchini / squash	warm	Direct sow: April 5
Bush beans	warm	Direct sow: April 5
Sweet corn	warm	Direct sow: April 5
Basil	warm	Transplant out: April 5
Peas	cool	Sow (spring): February 22 · Sow (fall): September 19
Spinach	cool	Sow (spring): February 15 · Sow (fall): September 19
Lettuce	cool	Sow (spring): March 1 · Sow (fall): September 19
Kale	cool	Transplant (spring): March 8 · Sow (fall): September 5
Broccoli	cool	Transplant (spring): March 15
Carrots	cool	Sow (spring): March 8 · Sow (fall): September 5
Onions	cool	Transplant (spring): March 1
Potatoes	cool	Plant seed potatoes: March 15
Radishes	cool	Sow (spring): March 1 · Sow (fall): October 3

Dates are computed from Bremerton's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Washington

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Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Bremerton, WA, 2.1 mi (confidence: high). Monthly weather normals: Bremerton, WA, 2.1 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.