Wilsall 8 ENE, MT Frost Dates & Growing Season

The two dates every Wilsall 8 ENE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Jun 8
~50% chance of frost after
First fall frost
Sep 7
~50% chance of frost before
Growing season
91 days
frost-free stretch
USDA zone
≈ 4b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 23 Jun 8 Jun 30
First fall frost Sep 22 Sep 7 Aug 21
Hard freeze (28°F), median last May 20 · first Sep 23

Computed from NOAA 1991–2020 climate normals at the WILSALL 8 ENE 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 Wilsall 8 ENE

Computed from Wilsall 8 ENE's own frost dates. Click any crop for the full zone-4 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Apr 13 – Apr 27 Jun 15 – Jun 22
🫑 Peppers Mar 30 – Apr 13 Jun 22 – Jun 29
🥬 Lettuce Apr 27 – May 11 May 11 – May 25 May 11 – Jun 8
🫛 Peas Apr 27 – May 11
🥕 Carrots May 18 – Jun 8
🥦 Broccoli Apr 20 – May 4 May 18 – Jun 1
🥬 Kale Apr 27 – May 11 May 11 – May 25 May 11 – May 25
🥒 Cucumbers May 11 – May 18 Jun 15 – Jun 22 Jun 15 – Jun 22
🥒 Zucchini May 11 – May 18 Jun 15 – Jun 22 Jun 15 – Jun 22
🫘 Green Beans (Bush) Jun 15 – Jun 22
🌽 Sweet Corn Jun 15 – Jun 22
🌿 Basil Apr 27 – May 11 Jun 15 – Jun 22 Jun 22 – Jun 29
🧄 Garlic Fall: Jul 27 – Aug 24

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 Wilsall 8 ENE's dates automatically after a lookup.

Reading the season in Wilsall 8 ENE

At about 91 frost-free days, Wilsall 8 ENE rewards efficiency: start warm-season crops indoors, favor short-season varieties, and lean on cold-tolerant crops — peas, kale, roots — that shrug off the shoulder-season frosts on either end.

Frequently asked questions

When is the last frost in Wilsall 8 ENE, MT?

The average last spring frost in Wilsall 8 ENE is around Jun 8, 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 Wilsall 8 ENE, MT?

The average first fall frost in Wilsall 8 ENE arrives around Sep 7. 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 Wilsall 8 ENE?

About 91 frost-free days on average, from Jun 8 to Sep 7. That favors short-season varieties and transplants for warm-season crops, with cool-season vegetables doing the heavy lifting in spring and fall.

What USDA zone is Wilsall 8 ENE in?

USDA zone 4b 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.