Newhalem, WA Frost Dates & Growing Season

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

Last spring frost
Apr 2
~50% chance of frost after
First fall frost
Nov 14
~50% chance of frost before
Growing season
226 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 9 Apr 2 Apr 27
First fall frost Dec 5 Nov 14 Oct 28
Hard freeze (28°F), median last Mar 2 · first Dec 4

Computed from NOAA 1991–2020 climate normals at the NEWHALEM 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 Newhalem

Computed from Newhalem'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 Feb 5 – Feb 19 Apr 9 – Apr 16
🫑 Peppers Jan 22 – Feb 5 Apr 16 – Apr 23
🥬 Lettuce Feb 19 – Mar 5 Mar 5 – Mar 19 Mar 5 – Apr 2
🫛 Peas Feb 19 – Mar 5
🥕 Carrots Mar 12 – Apr 2
🥦 Broccoli Feb 12 – Feb 26 Mar 12 – Mar 26
🥬 Kale Feb 19 – Mar 5 Mar 5 – Mar 19 Mar 5 – Mar 19
🥒 Cucumbers Mar 5 – Mar 12 Apr 9 – Apr 16 Apr 9 – Apr 16
🥒 Zucchini Mar 5 – Mar 12 Apr 9 – Apr 16 Apr 9 – Apr 16
🫘 Green Beans (Bush) Apr 9 – Apr 16
🌽 Sweet Corn Apr 9 – Apr 16
🌿 Basil Feb 19 – Mar 5 Apr 9 – Apr 16 Apr 16 – Apr 23
🧄 Garlic Fall: Oct 3 – Oct 31

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 Newhalem's dates automatically after a lookup.

Reading the season in Newhalem

With roughly 226 frost-free days, Newhalem 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 14 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Newhalem, WA?

The average last spring frost in Newhalem is around Apr 2, 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 Newhalem, WA?

The average first fall frost in Newhalem arrives around Nov 14. 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 Newhalem?

About 226 frost-free days on average, from Apr 2 to Nov 14. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Newhalem 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.