Ft Madison, IA Frost Dates & Growing Season

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

Last spring frost
Apr 12
~50% chance of frost after
First fall frost
Oct 25
~50% chance of frost before
Growing season
196 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 1 Apr 12 Apr 26
First fall frost Nov 6 Oct 25 Oct 11
Hard freeze (28°F), median last Apr 3 · first Nov 4

Computed from NOAA 1991–2020 climate normals at the FT MADISON 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 Ft Madison

Computed from Ft Madison'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 Feb 15 – Mar 1 Apr 19 – Apr 26
🫑 Peppers Feb 1 – Feb 15 Apr 26 – May 3
🥬 Lettuce Mar 1 – Mar 15 Mar 15 – Mar 29 Mar 15 – Apr 12
🫛 Peas Mar 1 – Mar 15
🥕 Carrots Mar 22 – Apr 12
🥦 Broccoli Feb 22 – Mar 8 Mar 22 – Apr 5
🥬 Kale Mar 1 – Mar 15 Mar 15 – Mar 29 Mar 15 – Mar 29
🥒 Cucumbers Mar 15 – Mar 22 Apr 19 – Apr 26 Apr 19 – Apr 26
🥒 Zucchini Mar 15 – Mar 22 Apr 19 – Apr 26 Apr 19 – Apr 26
🫘 Green Beans (Bush) Apr 19 – Apr 26
🌽 Sweet Corn Apr 19 – Apr 26
🌿 Basil Mar 1 – Mar 15 Apr 19 – Apr 26 Apr 26 – May 3
🧄 Garlic Fall: Sep 13 – Oct 11

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 Ft Madison's dates automatically after a lookup.

Reading the season in Ft Madison

Roughly 196 frost-free days gives Ft Madison gardeners room for nearly every common vegetable. Warm-season crops go out after Apr 12; a fall garden sown in late summer matures comfortably before the Oct 25 frost.

Frequently asked questions

When is the last frost in Ft Madison, IA?

The average last spring frost in Ft Madison is around Apr 12, 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 Ft Madison, IA?

The average first fall frost in Ft Madison arrives around Oct 25. 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 Ft Madison?

About 196 frost-free days on average, from Apr 12 to Oct 25. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Ft Madison 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.