Harbor Beach 1 SSE, MI Frost Dates & Growing Season

The two dates every Harbor Beach 1 SSE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 2
~50% chance of frost after
First fall frost
Oct 24
~50% chance of frost before
Growing season
175 days
frost-free stretch
USDA zone
≈ 6b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 19 May 2 May 17
First fall frost Nov 6 Oct 24 Oct 7
Hard freeze (28°F), median last Apr 20 · first Nov 3

Computed from NOAA 1991–2020 climate normals at the HARBOR BEACH 1 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 Harbor Beach 1 SSE

Computed from Harbor Beach 1 SSE's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Mar 7 – Mar 21 May 9 – May 16
🫑 Peppers Feb 21 – Mar 7 May 16 – May 23
🥬 Lettuce Mar 21 – Apr 4 Apr 4 – Apr 18 Apr 4 – May 2
🫛 Peas Mar 21 – Apr 4
🥕 Carrots Apr 11 – May 2
🥦 Broccoli Mar 14 – Mar 28 Apr 11 – Apr 25
🥬 Kale Mar 21 – Apr 4 Apr 4 – Apr 18 Apr 4 – Apr 18
🥒 Cucumbers Apr 4 – Apr 11 May 9 – May 16 May 9 – May 16
🥒 Zucchini Apr 4 – Apr 11 May 9 – May 16 May 9 – May 16
🫘 Green Beans (Bush) May 9 – May 16
🌽 Sweet Corn May 9 – May 16
🌿 Basil Mar 21 – Apr 4 May 9 – May 16 May 16 – May 23
🧄 Garlic Fall: Sep 12 – Oct 10

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 Harbor Beach 1 SSE's dates automatically after a lookup.

Reading the season in Harbor Beach 1 SSE

Roughly 175 frost-free days gives Harbor Beach 1 SSE gardeners room for nearly every common vegetable. Warm-season crops go out after May 2; a fall garden sown in late summer matures comfortably before the Oct 24 frost.

Frequently asked questions

When is the last frost in Harbor Beach 1 SSE, MI?

The average last spring frost in Harbor Beach 1 SSE is around May 2, 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 Harbor Beach 1 SSE, MI?

The average first fall frost in Harbor Beach 1 SSE arrives around Oct 24. 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 Harbor Beach 1 SSE?

About 175 frost-free days on average, from May 2 to Oct 24. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Harbor Beach 1 SSE in?

USDA zone 6b 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.