Humptulips Salmon Hatchery, WA Frost Dates & Growing Season

The two dates every Humptulips Salmon Hatchery garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Apr 26
~50% chance of frost after
First fall frost
Oct 22
~50% chance of frost before
Growing season
179 days
frost-free stretch
USDA zone
≈ 7a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 31 Apr 26 May 15
First fall frost Nov 15 Oct 22 Oct 3
Hard freeze (28°F), median last Mar 27 · first Nov 13

Computed from NOAA 1991–2020 climate normals at the HUMPTULIPS SALMON HATCHERY 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 Humptulips Salmon Hatchery

Computed from Humptulips Salmon Hatchery's own frost dates. Click any crop for the full zone-7 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Mar 1 – Mar 15 May 3 – May 10
🫑 Peppers Feb 15 – Mar 1 May 10 – May 17
🥬 Lettuce Mar 15 – Mar 29 Mar 29 – Apr 12 Mar 29 – Apr 26
🫛 Peas Mar 15 – Mar 29
🥕 Carrots Apr 5 – Apr 26
🥦 Broccoli Mar 8 – Mar 22 Apr 5 – Apr 19
🥬 Kale Mar 15 – Mar 29 Mar 29 – Apr 12 Mar 29 – Apr 12
🥒 Cucumbers Mar 29 – Apr 5 May 3 – May 10 May 3 – May 10
🥒 Zucchini Mar 29 – Apr 5 May 3 – May 10 May 3 – May 10
🫘 Green Beans (Bush) May 3 – May 10
🌽 Sweet Corn May 3 – May 10
🌿 Basil Mar 15 – Mar 29 May 3 – May 10 May 10 – May 17
🧄 Garlic Fall: Sep 10 – Oct 8

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 Humptulips Salmon Hatchery's dates automatically after a lookup.

Reading the season in Humptulips Salmon Hatchery

Roughly 179 frost-free days gives Humptulips Salmon Hatchery gardeners room for nearly every common vegetable. Warm-season crops go out after Apr 26; a fall garden sown in late summer matures comfortably before the Oct 22 frost.

Frequently asked questions

When is the last frost in Humptulips Salmon Hatchery, WA?

The average last spring frost in Humptulips Salmon Hatchery is around Apr 26, 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 Humptulips Salmon Hatchery, WA?

The average first fall frost in Humptulips Salmon Hatchery arrives around Oct 22. 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 Humptulips Salmon Hatchery?

About 179 frost-free days on average, from Apr 26 to Oct 22. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Humptulips Salmon Hatchery in?

USDA zone 7a 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.