Monroe Wwtp, WI Frost Dates & Growing Season

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

Last spring frost
Apr 27
~50% chance of frost after
First fall frost
Oct 14
~50% chance of frost before
Growing season
170 days
frost-free stretch
USDA zone
≈ 5b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 12 Apr 27 May 12
First fall frost Oct 29 Oct 14 Sep 29
Hard freeze (28°F), median last Apr 15 · first Oct 25

Computed from NOAA 1991–2020 climate normals at the MONROE 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 Monroe Wwtp

Computed from Monroe Wwtp'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 2 – Mar 16 May 4 – May 11
🫑 Peppers Feb 16 – Mar 2 May 11 – May 18
🥬 Lettuce Mar 16 – Mar 30 Mar 30 – Apr 13 Mar 30 – Apr 27
🫛 Peas Mar 16 – Mar 30
🥕 Carrots Apr 6 – Apr 27
🥦 Broccoli Mar 9 – Mar 23 Apr 6 – Apr 20
🥬 Kale Mar 16 – Mar 30 Mar 30 – Apr 13 Mar 30 – Apr 13
🥒 Cucumbers Mar 30 – Apr 6 May 4 – May 11 May 4 – May 11
🥒 Zucchini Mar 30 – Apr 6 May 4 – May 11 May 4 – May 11
🫘 Green Beans (Bush) May 4 – May 11
🌽 Sweet Corn May 4 – May 11
🌿 Basil Mar 16 – Mar 30 May 4 – May 11 May 11 – May 18
🧄 Garlic Fall: Sep 2 – Sep 30

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 Monroe Wwtp's dates automatically after a lookup.

Reading the season in Monroe Wwtp

Roughly 170 frost-free days gives Monroe Wwtp gardeners room for nearly every common vegetable. Warm-season crops go out after Apr 27; a fall garden sown in late summer matures comfortably before the Oct 14 frost.

Frequently asked questions

When is the last frost in Monroe Wwtp, WI?

The average last spring frost in Monroe Wwtp is around Apr 27, 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 Monroe Wwtp, WI?

The average first fall frost in Monroe Wwtp arrives around Oct 14. 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 Monroe Wwtp?

About 170 frost-free days on average, from Apr 27 to Oct 14. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Monroe Wwtp in?

USDA zone 5b 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.