Mellen 4 NE, WI Frost Dates & Growing Season

The two dates every Mellen 4 NE 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 27
~50% chance of frost before
Growing season
124 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 8 May 26 Jun 9
First fall frost Oct 11 Sep 27 Sep 12
Hard freeze (28°F), median last May 12 · first Oct 6

Computed from NOAA 1991–2020 climate normals at the MELLEN 4 NE 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 Mellen 4 NE

Computed from Mellen 4 NE'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 16 – Sep 13

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 Mellen 4 NE's dates automatically after a lookup.

Reading the season in Mellen 4 NE

At about 124 frost-free days, Mellen 4 NE 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 Mellen 4 NE, WI?

The average last spring frost in Mellen 4 NE 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 Mellen 4 NE, WI?

The average first fall frost in Mellen 4 NE arrives around Sep 27. 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 Mellen 4 NE?

About 124 frost-free days on average, from May 26 to Sep 27. 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 Mellen 4 NE 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.