Forman 5 SSE, ND Frost Dates & Growing Season

The two dates every Forman 5 SSE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 7
~50% chance of frost after
First fall frost
Oct 1
~50% chance of frost before
Growing season
147 days
frost-free stretch
USDA zone
≈ 4b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 24 May 7 May 20
First fall frost Oct 13 Oct 1 Sep 18
Hard freeze (28°F), median last Apr 29 · first Oct 9

Computed from NOAA 1991–2020 climate normals at the FORMAN 5 SSE 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 Forman 5 SSE

Computed from Forman 5 SSE'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 12 – Mar 26 May 14 – May 21
🫑 Peppers Feb 26 – Mar 12 May 21 – May 28
🥬 Lettuce Mar 26 – Apr 9 Apr 9 – Apr 23 Apr 9 – May 7
🫛 Peas Mar 26 – Apr 9
🥕 Carrots Apr 16 – May 7
🥦 Broccoli Mar 19 – Apr 2 Apr 16 – Apr 30
🥬 Kale Mar 26 – Apr 9 Apr 9 – Apr 23 Apr 9 – Apr 23
🥒 Cucumbers Apr 9 – Apr 16 May 14 – May 21 May 14 – May 21
🥒 Zucchini Apr 9 – Apr 16 May 14 – May 21 May 14 – May 21
🫘 Green Beans (Bush) May 14 – May 21
🌽 Sweet Corn May 14 – May 21
🌿 Basil Mar 26 – Apr 9 May 14 – May 21 May 21 – May 28
🧄 Garlic Fall: Aug 20 – Sep 17

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 Forman 5 SSE's dates automatically after a lookup.

Reading the season in Forman 5 SSE

At about 147 frost-free days, Forman 5 SSE 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 Forman 5 SSE, ND?

The average last spring frost in Forman 5 SSE is around May 7, 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 Forman 5 SSE, ND?

The average first fall frost in Forman 5 SSE arrives around Oct 1. 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 Forman 5 SSE?

About 147 frost-free days on average, from May 7 to Oct 1. 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 Forman 5 SSE 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.