Scobey 4 NW, MT Frost Dates & Growing Season

The two dates every Scobey 4 NW garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 28
~50% chance of frost after
First fall frost
Sep 6
~50% chance of frost before
Growing season
101 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 16 May 28 Jun 13
First fall frost Sep 19 Sep 6 Aug 24
Hard freeze (28°F), median last May 19 · first Sep 16

Computed from NOAA 1991–2020 climate normals at the SCOBEY 4 NW 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 Scobey 4 NW

Computed from Scobey 4 NW'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 2 – Apr 16 Jun 4 – Jun 11
🫑 Peppers Mar 19 – Apr 2 Jun 11 – Jun 18
🥬 Lettuce Apr 16 – Apr 30 Apr 30 – May 14 Apr 30 – May 28
🫛 Peas Apr 16 – Apr 30
🥕 Carrots May 7 – May 28
🥦 Broccoli Apr 9 – Apr 23 May 7 – May 21
🥬 Kale Apr 16 – Apr 30 Apr 30 – May 14 Apr 30 – May 14
🥒 Cucumbers Apr 30 – May 7 Jun 4 – Jun 11 Jun 4 – Jun 11
🥒 Zucchini Apr 30 – May 7 Jun 4 – Jun 11 Jun 4 – Jun 11
🫘 Green Beans (Bush) Jun 4 – Jun 11
🌽 Sweet Corn Jun 4 – Jun 11
🌿 Basil Apr 16 – Apr 30 Jun 4 – Jun 11 Jun 11 – Jun 18
🧄 Garlic Fall: Jul 26 – Aug 23

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 Scobey 4 NW's dates automatically after a lookup.

Reading the season in Scobey 4 NW

At about 101 frost-free days, Scobey 4 NW 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 Scobey 4 NW, MT?

The average last spring frost in Scobey 4 NW is around May 28, 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 Scobey 4 NW, MT?

The average first fall frost in Scobey 4 NW arrives around Sep 6. 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 Scobey 4 NW?

About 101 frost-free days on average, from May 28 to Sep 6. 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 Scobey 4 NW 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.