When is the last frost in Pasco, WA?

The average last spring frost (50% probability of 32°F) in Pasco is around April 30, based on NOAA/NCEI 1991–2020 normals at the Sagemoor, WA station (5.8 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 Pasco?

The average first fall frost in Pasco, WA is around October 13, giving roughly a 166-day frost-free growing season.

What planting zone is Pasco, WA?

Pasco is in USDA plant hardiness zone 7a (average annual extreme minimum temperature 0 to 5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Pasco?

In Pasco, WA the warmest month is July (avg high 89.1°F) and the coldest is January (avg low 28.8°F). It averages about 11.1″ of precipitation a year and 2″ of snow.

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Pasco, WA Planting Calendar & Frost Dates

USDA hardiness zone 7a · ZIP 99301 · elevation 112′ · NOAA & USDA data

Pasco is in USDA hardiness zone 7a (winters can dip to 0 to 5°F), with a growing season of about 166 days between the average last spring frost (April 30) and first fall frost (October 13). The warmest month is July (avg high 89.1°F); the coldest is January (avg low 28.8°F). It averages 11.1″ of precipitation a year and 2″ 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 0 to 5°F

Last spring frost

April 30

avg (50% prob, 32°F)

First fall frost

October 13

avg (50% prob, 32°F)

Growing season

166 days

frost-free window

Warmest month

July

avg high 89.1°F

Month-by-month typical weather in Pasco

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Ice Harbor Dam, WA (9.8 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	41.9	28.8	35.4	1.4	0.2
February	47.8	30	38.9	1	0.2
March	57.5	35	46.2	1	0.1
April	65.1	40.8	52.9	1	0
May	73.5	48.2	60.9	1.2	0
June	80	54.3	67.2	0.9	0
July	89.1	60.6	74.8	0.3	0
August	88.6	59.4	74	0.3	0
September	80	51.3	65.6	0.4	0
October	65.9	42	53.9	1	0
November	51.3	34.5	42.9	1.3	0.1
December	42.1	29.2	35.6	1.4	1.4

What to plant when in Pasco

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 19 · Transplant out: May 7
Peppers	warm	Start seeds indoors: March 5 · Transplant out: May 14
Cucumbers	warm	Direct sow: May 7
Zucchini / squash	warm	Direct sow: May 7
Bush beans	warm	Direct sow: May 7
Sweet corn	warm	Direct sow: May 7
Basil	warm	Transplant out: May 7
Peas	cool	Sow (spring): March 26 · Sow (fall): August 18
Spinach	cool	Sow (spring): March 19 · Sow (fall): August 18
Lettuce	cool	Sow (spring): April 2 · Sow (fall): August 18
Kale	cool	Transplant (spring): April 9 · Sow (fall): August 4
Broccoli	cool	Transplant (spring): April 16
Carrots	cool	Sow (spring): April 9 · Sow (fall): August 4
Onions	cool	Transplant (spring): April 2
Potatoes	cool	Plant seed potatoes: April 16
Radishes	cool	Sow (spring): April 2 · Sow (fall): September 1

Dates are computed from Pasco'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

Kennewick, WA Richland, WA Yakima, WA Spokane, WA Auburn, WA Sammamish, WA Kent, WA Puyallup, WA

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 — Sagemoor, WA, 5.8 mi (confidence: high). Monthly weather normals: Ice Harbor Dam, WA, 9.8 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.