Priest Rapids Dam, WA Frost Dates & Growing Season

The two dates every Priest Rapids Dam garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 24
~50% chance of frost after
First fall frost
Nov 4
~50% chance of frost before
Growing season
225 days
frost-free stretch
USDA zone
≈ 9a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 4 Mar 24 Apr 7
First fall frost Nov 18 Nov 4 Oct 23
Hard freeze (28°F), median last Mar 5 · first Nov 16

Computed from NOAA 1991–2020 climate normals at the PRIEST RAPIDS DAM station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Priest Rapids Dam

Computed from Priest Rapids Dam's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Jan 27 – Feb 10 Mar 31 – Apr 7
🫑 Peppers Jan 13 – Jan 27 Apr 7 – Apr 14
🥬 Lettuce Feb 10 – Feb 24 Feb 24 – Mar 10 Feb 24 – Mar 24
🫛 Peas Feb 10 – Feb 24
🥕 Carrots Mar 3 – Mar 24
🥦 Broccoli Feb 3 – Feb 17 Mar 3 – Mar 17
🥬 Kale Feb 10 – Feb 24 Feb 24 – Mar 10 Feb 24 – Mar 10
🥒 Cucumbers Feb 24 – Mar 3 Mar 31 – Apr 7 Mar 31 – Apr 7
🥒 Zucchini Feb 24 – Mar 3 Mar 31 – Apr 7 Mar 31 – Apr 7
🫘 Green Beans (Bush) Mar 31 – Apr 7
🌽 Sweet Corn Mar 31 – Apr 7
🌿 Basil Feb 10 – Feb 24 Mar 31 – Apr 7 Apr 7 – Apr 14
🧄 Garlic Fall: Sep 23 – Oct 21

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Priest Rapids Dam's dates automatically after a lookup.

Reading the season in Priest Rapids Dam

With roughly 225 frost-free days, Priest Rapids Dam gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 4 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Priest Rapids Dam, WA?

The average last spring frost in Priest Rapids Dam is around Mar 24, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Priest Rapids Dam, WA?

The average first fall frost in Priest Rapids Dam arrives around Nov 4. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Priest Rapids Dam?

About 225 frost-free days on average, from Mar 24 to Nov 4. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Priest Rapids Dam in?

USDA zone 9a on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.