Greenland 6N, MI Frost Dates & Growing Season

The two dates every Greenland 6N garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 23
~50% chance of frost after
First fall frost
Oct 1
~50% chance of frost before
Growing season
131 days
frost-free stretch
USDA zone
≈ 5a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 6 May 23 Jun 8
First fall frost Oct 16 Oct 1 Sep 14
Hard freeze (28°F), median last May 6 · first Oct 14

Computed from NOAA 1991–2020 climate normals at the GREENLAND 6N 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 Greenland 6N

Computed from Greenland 6N's own frost dates. Click any crop for the full zone-5 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Mar 28 – Apr 11 May 30 – Jun 6
🫑 Peppers Mar 14 – Mar 28 Jun 6 – Jun 13
🥬 Lettuce Apr 11 – Apr 25 Apr 25 – May 9 Apr 25 – May 23
🫛 Peas Apr 11 – Apr 25
🥕 Carrots May 2 – May 23
🥦 Broccoli Apr 4 – Apr 18 May 2 – May 16
🥬 Kale Apr 11 – Apr 25 Apr 25 – May 9 Apr 25 – May 9
🥒 Cucumbers Apr 25 – May 2 May 30 – Jun 6 May 30 – Jun 6
🥒 Zucchini Apr 25 – May 2 May 30 – Jun 6 May 30 – Jun 6
🫘 Green Beans (Bush) May 30 – Jun 6
🌽 Sweet Corn May 30 – Jun 6
🌿 Basil Apr 11 – Apr 25 May 30 – Jun 6 Jun 6 – Jun 13
🧄 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 Greenland 6N's dates automatically after a lookup.

Reading the season in Greenland 6N

At about 131 frost-free days, Greenland 6N 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 Greenland 6N, MI?

The average last spring frost in Greenland 6N is around May 23, 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 Greenland 6N, MI?

The average first fall frost in Greenland 6N 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 Greenland 6N?

About 131 frost-free days on average, from May 23 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 Greenland 6N in?

USDA zone 5a 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.