Warm-Season Vegetable

When to Plant Squash (Summer) in Minnesota

Zucchini and yellow squash are the garden's most generous producers. You'll be sharing with neighbors by midsummer.

The Short Answer

In Minnesota, squash (summer) planting dates vary by region. In Northern Minnesota, your average last frost is around May 15 - Jun 1, while Southern Minnesota sees its last frost around Apr 25 - May 10. Since squash (summer) are frost-sensitive, start seeds indoors 3 weeks before your last frost, then transplant outside 2 weeks after frost danger has passed. Rich prairie soils in south and west. Rocky and thin soils in north. Generally excellent for gardening in southern half.

Minnesota Frost Dates

Your planting dates depend on which part of Minnesota you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Minnesota 3a, 3b May 15 - Jun 1 Sep 5 - Sep 20
Central Minnesota 3b, 4a May 5 - May 20 Sep 15 - Oct 1
Southern Minnesota 4a, 4b Apr 25 - May 10 Sep 25 - Oct 10

Squash (Summer) Planting Schedule for Minnesota

Northern Minnesota (Zones 3a, 3b)

Average last frost: May 15 - Jun 1 · Average first frost: Sep 5 - Sep 20

Start Seeds Indoors
3 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Central Minnesota (Zones 3b, 4a)

Average last frost: May 5 - May 20 · Average first frost: Sep 15 - Oct 1

Start Seeds Indoors
3 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Southern Minnesota (Zones 4a, 4b)

Average last frost: Apr 25 - May 10 · Average first frost: Sep 25 - Oct 10

Start Seeds Indoors
3 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Growing Squash (Summer) in Minnesota

Squash (Summer) in Minnesota's Climate

Summer squash (zucchini, yellow squash) is one of the most productive crops for short-season gardens — 45-60 day maturity means even 100-day seasons produce abundant harvests. Direct sow after soil reaches 60°F. Two or three plants produce more squash than most families can eat. Squash vine borer is less prevalent in cold zones, reducing the most frustrating squash pest.

Soil Considerations for Minnesota

Rich prairie soils in south and west. Rocky and thin soils in north. Generally excellent for gardening in southern half. Make sure soil has warmed to at least 60°F before planting squash (summer) outside.

Minnesota Climate & Growing Season

Long, cold winters. Warm summers. Short but productive growing season with long summer days. Hardy varieties essential. Squash (Summer) cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.

Growing season length varies across Minnesota: Northern Minnesota (3a, 3b) has a last frost around May 15 - Jun 1, while Southern Minnesota (4a, 4b) sees frost end around Apr 25 - May 10. This difference matters for squash (summer) — transplant timing shifts by several weeks across the state.

Growing Tips

Harvest when fruits are 6-8 inches long for best flavor. Larger squash become seedy and tough.

Companion Planting

Plant squash (summer) alongside these companions for better growth:

Corn Beans Nasturtiums

Keep squash (summer) away from:

Potatoes

The Bottom Line

Squash (Summer) can be grown successfully across Minnesota, but your exact planting dates depend on which region you're in. Northern Minnesota gardeners should plan around a May 15 - Jun 1 last frost, while those in Southern Minnesota can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Squash (Summer) Growing Guide National planting guide with all states Minnesota Planting Calendar All plants for Minnesota Squash (Summer) in Alabama Alabama planting dates Squash (Summer) in Alaska Alaska planting dates Squash (Summer) in Arizona Arizona planting dates Squash (Summer) in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

Ready to Start Planting?

Enter your zip code and pick your plant. We'll tell you exactly when to plant, start seeds, and harvest — based on where you live.

Find Your Planting Dates