Grassy Butte 2ENE, ND Frost Dates & Growing Season

The two dates every Grassy Butte 2ENE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 18
~50% chance of frost after
First fall frost
Sep 23
~50% chance of frost before
Growing season
128 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 7 May 18 Jun 1
First fall frost Oct 5 Sep 23 Sep 9
Hard freeze (28°F), median last May 9 · first Oct 3

Computed from NOAA 1991–2020 climate normals at the GRASSY BUTTE 2ENE 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 Grassy Butte 2ENE

Computed from Grassy Butte 2ENE'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 23 – Apr 6 May 25 – Jun 1
🫑 Peppers Mar 9 – Mar 23 Jun 1 – Jun 8
🥬 Lettuce Apr 6 – Apr 20 Apr 20 – May 4 Apr 20 – May 18
🫛 Peas Apr 6 – Apr 20
🥕 Carrots Apr 27 – May 18
🥦 Broccoli Mar 30 – Apr 13 Apr 27 – May 11
🥬 Kale Apr 6 – Apr 20 Apr 20 – May 4 Apr 20 – May 4
🥒 Cucumbers Apr 20 – Apr 27 May 25 – Jun 1 May 25 – Jun 1
🥒 Zucchini Apr 20 – Apr 27 May 25 – Jun 1 May 25 – Jun 1
🫘 Green Beans (Bush) May 25 – Jun 1
🌽 Sweet Corn May 25 – Jun 1
🌿 Basil Apr 6 – Apr 20 May 25 – Jun 1 Jun 1 – Jun 8
🧄 Garlic Fall: Aug 12 – Sep 9

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 Grassy Butte 2ENE's dates automatically after a lookup.

Reading the season in Grassy Butte 2ENE

At about 128 frost-free days, Grassy Butte 2ENE 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 Grassy Butte 2ENE, ND?

The average last spring frost in Grassy Butte 2ENE is around May 18, 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 Grassy Butte 2ENE, ND?

The average first fall frost in Grassy Butte 2ENE arrives around Sep 23. 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 Grassy Butte 2ENE?

About 128 frost-free days on average, from May 18 to Sep 23. 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 Grassy Butte 2ENE 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.