W Thompson Lake, CT Frost Dates & Growing Season

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

Last spring frost
May 1
~50% chance of frost after
First fall frost
Oct 9
~50% chance of frost before
Growing season
161 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 20 May 1 May 17
First fall frost Oct 26 Oct 9 Sep 30
Hard freeze (28°F), median last Apr 19 · first Oct 21

Computed from NOAA 1991–2020 climate normals at the W THOMPSON LAKE 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 W Thompson Lake

Computed from W Thompson Lake'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 6 – Mar 20 May 8 – May 15
🫑 Peppers Feb 20 – Mar 6 May 15 – May 22
🥬 Lettuce Mar 20 – Apr 3 Apr 3 – Apr 17 Apr 3 – May 1
🫛 Peas Mar 20 – Apr 3
🥕 Carrots Apr 10 – May 1
🥦 Broccoli Mar 13 – Mar 27 Apr 10 – Apr 24
🥬 Kale Mar 20 – Apr 3 Apr 3 – Apr 17 Apr 3 – Apr 17
🥒 Cucumbers Apr 3 – Apr 10 May 8 – May 15 May 8 – May 15
🥒 Zucchini Apr 3 – Apr 10 May 8 – May 15 May 8 – May 15
🫘 Green Beans (Bush) May 8 – May 15
🌽 Sweet Corn May 8 – May 15
🌿 Basil Mar 20 – Apr 3 May 8 – May 15 May 15 – May 22
🧄 Garlic Fall: Aug 28 – Sep 25

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 W Thompson Lake's dates automatically after a lookup.

Reading the season in W Thompson Lake

Roughly 161 frost-free days gives W Thompson Lake gardeners room for nearly every common vegetable. Warm-season crops go out after May 1; a fall garden sown in late summer matures comfortably before the Oct 9 frost.

Frequently asked questions

When is the last frost in W Thompson Lake, CT?

The average last spring frost in W Thompson Lake is around May 1, 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 W Thompson Lake, CT?

The average first fall frost in W Thompson Lake arrives around Oct 9. 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 W Thompson Lake?

About 161 frost-free days on average, from May 1 to Oct 9. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is W Thompson Lake 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.