Logan Landfill, MT Frost Dates & Growing Season

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

Last spring frost
May 26
~50% chance of frost after
First fall frost
Sep 15
~50% chance of frost before
Growing season
112 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 11 May 26 Jun 12
First fall frost Sep 28 Sep 15 Sep 1
Hard freeze (28°F), median last May 11 · first Sep 27

Computed from NOAA 1991–2020 climate normals at the LOGAN LANDFILL 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 Logan Landfill

Computed from Logan Landfill'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 Mar 31 – Apr 14 Jun 2 – Jun 9
🫑 Peppers Mar 17 – Mar 31 Jun 9 – Jun 16
🥬 Lettuce Apr 14 – Apr 28 Apr 28 – May 12 Apr 28 – May 26
🫛 Peas Apr 14 – Apr 28
🥕 Carrots May 5 – May 26
🥦 Broccoli Apr 7 – Apr 21 May 5 – May 19
🥬 Kale Apr 14 – Apr 28 Apr 28 – May 12 Apr 28 – May 12
🥒 Cucumbers Apr 28 – May 5 Jun 2 – Jun 9 Jun 2 – Jun 9
🥒 Zucchini Apr 28 – May 5 Jun 2 – Jun 9 Jun 2 – Jun 9
🫘 Green Beans (Bush) Jun 2 – Jun 9
🌽 Sweet Corn Jun 2 – Jun 9
🌿 Basil Apr 14 – Apr 28 Jun 2 – Jun 9 Jun 9 – Jun 16
🧄 Garlic Fall: Aug 4 – Sep 1

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 Logan Landfill's dates automatically after a lookup.

Reading the season in Logan Landfill

At about 112 frost-free days, Logan Landfill 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 Logan Landfill, MT?

The average last spring frost in Logan Landfill is around May 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 Logan Landfill, MT?

The average first fall frost in Logan Landfill arrives around Sep 15. 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 Logan Landfill?

About 112 frost-free days on average, from May 26 to Sep 15. 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 Logan Landfill 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.