When is the last frost in Richland, WA?

The average last spring frost (50% probability of 32°F) in Richland is around April 6, based on NOAA/NCEI 1991–2020 normals at the Richland, WA station (4.8 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 Richland?

The average first fall frost in Richland, WA is around October 24, giving roughly a 200-day frost-free growing season.

What planting zone is Richland, WA?

Richland is in USDA plant hardiness zone 7b (average annual extreme minimum temperature 5 to 10°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Richland?

In Richland, WA the warmest month is July (avg high 89.3°F) and the coldest is December (avg low 28.4°F). It averages about 7.3″ of precipitation a year.

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Richland, WA Planting Calendar & Frost Dates

USDA hardiness zone 7b · ZIP 99352 · elevation 114′ · NOAA & USDA data

Richland is in USDA hardiness zone 7b (winters can dip to 5 to 10°F), with a growing season of about 200 days between the average last spring frost (April 6) and first fall frost (October 24). The warmest month is July (avg high 89.3°F); the coldest is December (avg low 28.4°F). It averages 7.3″ of precipitation a year. 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 5 to 10°F

Last spring frost

April 6

avg (50% prob, 32°F)

First fall frost

October 24

avg (50% prob, 32°F)

Growing season

200 days

frost-free window

Warmest month

July

avg high 89.3°F

Month-by-month typical weather in Richland

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Richland, WA (4.8 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	40.6	28.8	34.7	1	–
February	47.5	30.1	38.8	0.7	–
March	57.1	35.1	46.1	0.6	–
April	65.1	41	53	0.6	–
May	73.9	48.3	61.1	0.6	–
June	80.2	54.4	67.3	0.6	–
July	89.3	60	74.7	0.2	–
August	88.1	59	73.6	0.1	–
September	78.9	51.4	65.2	0.3	–
October	64.3	41.7	53	0.5	–
November	49	33.6	41.3	0.9	–
December	39.9	28.4	34.1	1.1	–

What to plant when in Richland

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 23 · Transplant out: April 13
Peppers	warm	Start seeds indoors: February 9 · Transplant out: April 20
Cucumbers	warm	Direct sow: April 13
Zucchini / squash	warm	Direct sow: April 13
Bush beans	warm	Direct sow: April 13
Sweet corn	warm	Direct sow: April 13
Basil	warm	Transplant out: April 13
Peas	cool	Sow (spring): March 2 · Sow (fall): August 29
Spinach	cool	Sow (spring): February 23 · Sow (fall): August 29
Lettuce	cool	Sow (spring): March 9 · Sow (fall): August 29
Kale	cool	Transplant (spring): March 16 · Sow (fall): August 15
Broccoli	cool	Transplant (spring): March 23
Carrots	cool	Sow (spring): March 16 · Sow (fall): August 15
Onions	cool	Transplant (spring): March 9
Potatoes	cool	Plant seed potatoes: March 23
Radishes	cool	Sow (spring): March 9 · Sow (fall): September 12

Dates are computed from Richland'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 Pasco, WA Yakima, WA Spokane, WA Auburn, WA Puyallup, WA Kent, WA Sammamish, 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 — Richland, WA, 4.8 mi (confidence: high). Monthly weather normals: Richland, WA, 4.8 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.