Aberdeen, WA planting zone & frost dates

Aberdeen is in USDA hardiness zone 8b. The last spring frost usually comes around March 29 and the first fall frost around November 15, for a growing season of about 234 days.

USDA hardiness zone8bavg. extreme winter low 15°F to 20°F

Average last spring frostMarch 2990% chance of no frost after April 20

Average first fall frostNovember 1510% chance of frost by October 27

Growing season234 daysfrost-free days in an average year

Planting calendar for Aberdeen

Dates are counted from the average last spring frost (March 29) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.

Crop	When
Tomatoes	Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Apr 5 – Apr 12
Peppers	Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Apr 12 – Apr 19
Eggplant	Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Apr 12 – Apr 19
Broccoli	Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 1 – Mar 15
Cabbage	Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 1 – Mar 15
Onions (sets)	Plant outdoors: Mar 1 – Mar 15
Peas	Sow outdoors: Feb 15 – Mar 1
Spinach	Sow outdoors: Feb 15 – Mar 1
Lettuce	Sow outdoors: Mar 1 – Mar 15
Carrots	Sow outdoors: Mar 1 – Mar 15
Potatoes	Plant outdoors: Mar 1 – Mar 15
Beans	Sow outdoors: Apr 5 – Apr 12
Sweet corn	Sow outdoors: Apr 5 – Apr 12
Cucumbers	Sow outdoors: Apr 5 – Apr 12
Squash & zucchini	Sow outdoors: Apr 5 – Apr 12
Basil	Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: Apr 5 – Apr 12

Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 20 (8 weeks before the average first fall frost on Nov 15).

Useful for zone 8b gardens

Seed starting kit with dome — to start seeds indoors before the last frost
LED grow light for seedlings — stops leggy seedlings
Frost cloth / plant covers — for late spring and early fall frosts
Soil thermometer — warm-season crops need soil above 60°F

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Frost risk in detail

	90% chance	50% chance	10% chance
Last 32°F frost in spring is after	Feb 25	Mar 29	Apr 20
First 32°F frost in fall is before	Dec 10	Nov 15	Oct 27

How to read it: in spring there is a 10% chance of a frost after April 20, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 27. A hard freeze (28°F) usually ends around February 18.

Hardiness zone by ZIP code in Aberdeen

98520 zone 8b

Nearby cities

Centralia zone 8b, last frost Apr 22
Tumwater zone 8b, last frost Apr 29
Olympia zone 8b, last frost Apr 29
Lacey zone 8b, last frost Apr 29
Port Angeles zone 8b, last frost Mar 12
Longview zone 8b, last frost Apr 8
Kelso zone 8b, last frost Apr 8
Artondale zone 9a, last frost Mar 11

All cities in Washington → · Other zone 8b cities →

Questions

What growing zone is Aberdeen, WA?

Aberdeen is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map.

When is the last frost in Aberdeen?

The average last spring frost (32°F) in Aberdeen is March 29. There is still a 10% chance of frost until April 20.

When can I plant tomatoes in Aberdeen?

Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 5 – Apr 12. Start seeds indoors 6–8 weeks before the last frost.

Frost dates: NOAA U.S. Climate Normals 1991–2020, station Aberdeen, WA (USC00450008), 1.5 km (0.9 mi) from the city center, elevation 3 m, based on 29 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.