Guttenberg L&d 10, IA Frost Dates & Growing Season

The two dates every Guttenberg L&d 10 garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Apr 21
~50% chance of frost after
First fall frost
Oct 18
~50% chance of frost before
Growing season
180 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 7 Apr 21 May 6
First fall frost Oct 30 Oct 18 Oct 4
Hard freeze (28°F), median last Apr 9 · first Oct 27

Computed from NOAA 1991–2020 climate normals at the GUTTENBERG L&D 10 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 Guttenberg L&d 10

Computed from Guttenberg L&d 10'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 Feb 24 – Mar 10 Apr 28 – May 5
🫑 Peppers Feb 10 – Feb 24 May 5 – May 12
🥬 Lettuce Mar 10 – Mar 24 Mar 24 – Apr 7 Mar 24 – Apr 21
🫛 Peas Mar 10 – Mar 24
🥕 Carrots Mar 31 – Apr 21
🥦 Broccoli Mar 3 – Mar 17 Mar 31 – Apr 14
🥬 Kale Mar 10 – Mar 24 Mar 24 – Apr 7 Mar 24 – Apr 7
🥒 Cucumbers Mar 24 – Mar 31 Apr 28 – May 5 Apr 28 – May 5
🥒 Zucchini Mar 24 – Mar 31 Apr 28 – May 5 Apr 28 – May 5
🫘 Green Beans (Bush) Apr 28 – May 5
🌽 Sweet Corn Apr 28 – May 5
🌿 Basil Mar 10 – Mar 24 Apr 28 – May 5 May 5 – May 12
🧄 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 Guttenberg L&d 10's dates automatically after a lookup.

Reading the season in Guttenberg L&d 10

Roughly 180 frost-free days gives Guttenberg L&d 10 gardeners room for nearly every common vegetable. Warm-season crops go out after Apr 21; a fall garden sown in late summer matures comfortably before the Oct 18 frost.

Frequently asked questions

When is the last frost in Guttenberg L&d 10, IA?

The average last spring frost in Guttenberg L&d 10 is around Apr 21, 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 Guttenberg L&d 10, IA?

The average first fall frost in Guttenberg L&d 10 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 Guttenberg L&d 10?

About 180 frost-free days on average, from Apr 21 to Oct 18. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Guttenberg L&d 10 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.