Carbondale Sewage Plt, IL Frost Dates & Growing Season

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

Last spring frost
Apr 9
~50% chance of frost after
First fall frost
Oct 22
~50% chance of frost before
Growing season
196 days
frost-free stretch
USDA zone
≈ 7a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 25 Apr 9 Apr 25
First fall frost Nov 2 Oct 22 Oct 10
Hard freeze (28°F), median last Mar 29 · first Nov 1

Computed from NOAA 1991–2020 climate normals at the CARBONDALE SEWAGE PLT 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 Carbondale Sewage Plt

Computed from Carbondale Sewage Plt's own frost dates. Click any crop for the full zone-7 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Feb 12 – Feb 26 Apr 16 – Apr 23
🫑 Peppers Jan 29 – Feb 12 Apr 23 – Apr 30
🥬 Lettuce Feb 26 – Mar 12 Mar 12 – Mar 26 Mar 12 – Apr 9
🫛 Peas Feb 26 – Mar 12
🥕 Carrots Mar 19 – Apr 9
🥦 Broccoli Feb 19 – Mar 5 Mar 19 – Apr 2
🥬 Kale Feb 26 – Mar 12 Mar 12 – Mar 26 Mar 12 – Mar 26
🥒 Cucumbers Mar 12 – Mar 19 Apr 16 – Apr 23 Apr 16 – Apr 23
🥒 Zucchini Mar 12 – Mar 19 Apr 16 – Apr 23 Apr 16 – Apr 23
🫘 Green Beans (Bush) Apr 16 – Apr 23
🌽 Sweet Corn Apr 16 – Apr 23
🌿 Basil Feb 26 – Mar 12 Apr 16 – Apr 23 Apr 23 – Apr 30
🧄 Garlic Fall: Sep 10 – Oct 8

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 Carbondale Sewage Plt's dates automatically after a lookup.

Reading the season in Carbondale Sewage Plt

Roughly 196 frost-free days gives Carbondale Sewage Plt gardeners room for nearly every common vegetable. Warm-season crops go out after Apr 9; a fall garden sown in late summer matures comfortably before the Oct 22 frost.

Frequently asked questions

When is the last frost in Carbondale Sewage Plt, IL?

The average last spring frost in Carbondale Sewage Plt is around Apr 9, 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 Carbondale Sewage Plt, IL?

The average first fall frost in Carbondale Sewage Plt arrives around Oct 22. 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 Carbondale Sewage Plt?

About 196 frost-free days on average, from Apr 9 to Oct 22. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Carbondale Sewage Plt in?

USDA zone 7a 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.