Hallock, MN Frost Dates & Growing Season

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

Last spring frost
May 8
~50% chance of frost after
First fall frost
Sep 30
~50% chance of frost before
Growing season
145 days
frost-free stretch
USDA zone
≈ 4a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 25 May 8 May 24
First fall frost Oct 10 Sep 30 Sep 16
Hard freeze (28°F), median last Apr 30 · first Oct 6

Computed from NOAA 1991–2020 climate normals at the HALLOCK 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 Hallock

Computed from Hallock'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 13 – Mar 27 May 15 – May 22
🫑 Peppers Feb 27 – Mar 13 May 22 – May 29
🥬 Lettuce Mar 27 – Apr 10 Apr 10 – Apr 24 Apr 10 – May 8
🫛 Peas Mar 27 – Apr 10
🥕 Carrots Apr 17 – May 8
🥦 Broccoli Mar 20 – Apr 3 Apr 17 – May 1
🥬 Kale Mar 27 – Apr 10 Apr 10 – Apr 24 Apr 10 – Apr 24
🥒 Cucumbers Apr 10 – Apr 17 May 15 – May 22 May 15 – May 22
🥒 Zucchini Apr 10 – Apr 17 May 15 – May 22 May 15 – May 22
🫘 Green Beans (Bush) May 15 – May 22
🌽 Sweet Corn May 15 – May 22
🌿 Basil Mar 27 – Apr 10 May 15 – May 22 May 22 – May 29
🧄 Garlic Fall: Aug 19 – Sep 16

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 Hallock's dates automatically after a lookup.

Reading the season in Hallock

At about 145 frost-free days, Hallock 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 Hallock, MN?

The average last spring frost in Hallock is around May 8, 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 Hallock, MN?

The average first fall frost in Hallock arrives around Sep 30. 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 Hallock?

About 145 frost-free days on average, from May 8 to Sep 30. 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 Hallock in?

USDA zone 4a 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.