Ephraim 1NE-WWTP, WI Frost Dates & Growing Season

The two dates every Ephraim 1NE-WWTP garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 14
~50% chance of frost after
First fall frost
Oct 18
~50% chance of frost before
Growing season
157 days
frost-free stretch
USDA zone
≈ 6a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 28 May 14 May 28
First fall frost Nov 3 Oct 18 Oct 1
Hard freeze (28°F), median last May 1 · first Nov 1

Computed from NOAA 1991–2020 climate normals at the EPHRAIM 1NE-WWTP 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 Ephraim 1NE-WWTP

Computed from Ephraim 1NE-WWTP'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 19 – Apr 2 May 21 – May 28
🫑 Peppers Mar 5 – Mar 19 May 28 – Jun 4
🥬 Lettuce Apr 2 – Apr 16 Apr 16 – Apr 30 Apr 16 – May 14
🫛 Peas Apr 2 – Apr 16
🥕 Carrots Apr 23 – May 14
🥦 Broccoli Mar 26 – Apr 9 Apr 23 – May 7
🥬 Kale Apr 2 – Apr 16 Apr 16 – Apr 30 Apr 16 – Apr 30
🥒 Cucumbers Apr 16 – Apr 23 May 21 – May 28 May 21 – May 28
🥒 Zucchini Apr 16 – Apr 23 May 21 – May 28 May 21 – May 28
🫘 Green Beans (Bush) May 21 – May 28
🌽 Sweet Corn May 21 – May 28
🌿 Basil Apr 2 – Apr 16 May 21 – May 28 May 28 – Jun 4
🧄 Garlic Fall: Sep 6 – Oct 4

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 Ephraim 1NE-WWTP's dates automatically after a lookup.

Reading the season in Ephraim 1NE-WWTP

Roughly 157 frost-free days gives Ephraim 1NE-WWTP gardeners room for nearly every common vegetable. Warm-season crops go out after May 14; a fall garden sown in late summer matures comfortably before the Oct 18 frost.

Frequently asked questions

When is the last frost in Ephraim 1NE-WWTP, WI?

The average last spring frost in Ephraim 1NE-WWTP is around May 14, 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 Ephraim 1NE-WWTP, WI?

The average first fall frost in Ephraim 1NE-WWTP arrives around Oct 18. 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 Ephraim 1NE-WWTP?

About 157 frost-free days on average, from May 14 to Oct 18. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Ephraim 1NE-WWTP in?

USDA zone 6a 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.