Coeur d’Alene, ID Frost Dates & Growing Season

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

Last spring frost
Apr 22
~50% chance of frost after
First fall frost
Oct 18
~50% chance of frost before
Growing season
179 days
frost-free stretch
USDA zone
6b
2023 hardiness map
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 4 Apr 22 May 6
First fall frost Nov 5 Oct 18 Oct 4
Hard freeze (28°F), median last Apr 1 · first Nov 1

Computed from NOAA 1991–2020 climate normals at the Coeur D'alene station (1 km from central Coeur d’Alene). "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 Coeur d’Alene

Computed from Coeur d’Alene's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Feb 25 – Mar 11 Apr 29 – May 6
🫑 Peppers Feb 11 – Feb 25 May 6 – May 13
🥬 Lettuce Mar 11 – Mar 25 Mar 25 – Apr 8 Mar 25 – Apr 22
🫛 Peas Mar 11 – Mar 25
🥕 Carrots Apr 1 – Apr 22
🥦 Broccoli Mar 4 – Mar 18 Apr 1 – Apr 15
🥬 Kale Mar 11 – Mar 25 Mar 25 – Apr 8 Mar 25 – Apr 8
🥒 Cucumbers Mar 25 – Apr 1 Apr 29 – May 6 Apr 29 – May 6
🥒 Zucchini Mar 25 – Apr 1 Apr 29 – May 6 Apr 29 – May 6
🫘 Green Beans (Bush) Apr 29 – May 6
🌽 Sweet Corn Apr 29 – May 6
🌿 Basil Mar 11 – Mar 25 Apr 29 – May 6 May 6 – May 13
🧄 Garlic Fall: Sep 6 – Oct 4

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 Coeur d’Alene's dates automatically after a lookup.

Reading the season in Coeur d’Alene

Roughly 179 frost-free days gives Coeur d’Alene gardeners room for nearly every common vegetable. Warm-season crops go out after Apr 22; a fall garden sown in late summer matures comfortably before the Oct 18 frost.

Frequently asked questions

When is the last frost in Coeur d’Alene, ID?

The average last spring frost in Coeur d’Alene is around Apr 22, 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 Coeur d’Alene, ID?

The average first fall frost in Coeur d’Alene arrives around Oct 18. 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 Coeur d’Alene?

About 179 frost-free days on average, from Apr 22 to Oct 18. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Coeur d’Alene in?

USDA zone 6b 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.