Rolette 3SE, ND Frost Dates & Growing Season

The two dates every Rolette 3SE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 22
~50% chance of frost after
First fall frost
Sep 20
~50% chance of frost before
Growing season
121 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 10 May 22 Jun 3
First fall frost Oct 1 Sep 20 Sep 5
Hard freeze (28°F), median last May 13 · first Sep 27

Computed from NOAA 1991–2020 climate normals at the ROLETTE 3SE 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 Rolette 3SE

Computed from Rolette 3SE'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 27 – Apr 10 May 29 – Jun 5
🫑 Peppers Mar 13 – Mar 27 Jun 5 – Jun 12
🥬 Lettuce Apr 10 – Apr 24 Apr 24 – May 8 Apr 24 – May 22
🫛 Peas Apr 10 – Apr 24
🥕 Carrots May 1 – May 22
🥦 Broccoli Apr 3 – Apr 17 May 1 – May 15
🥬 Kale Apr 10 – Apr 24 Apr 24 – May 8 Apr 24 – May 8
🥒 Cucumbers Apr 24 – May 1 May 29 – Jun 5 May 29 – Jun 5
🥒 Zucchini Apr 24 – May 1 May 29 – Jun 5 May 29 – Jun 5
🫘 Green Beans (Bush) May 29 – Jun 5
🌽 Sweet Corn May 29 – Jun 5
🌿 Basil Apr 10 – Apr 24 May 29 – Jun 5 Jun 5 – Jun 12
🧄 Garlic Fall: Aug 9 – Sep 6

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 Rolette 3SE's dates automatically after a lookup.

Reading the season in Rolette 3SE

At about 121 frost-free days, Rolette 3SE 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 Rolette 3SE, ND?

The average last spring frost in Rolette 3SE is around May 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 Rolette 3SE, ND?

The average first fall frost in Rolette 3SE arrives around Sep 20. 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 Rolette 3SE?

About 121 frost-free days on average, from May 22 to Sep 20. 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 Rolette 3SE 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.