St. Cloud, MN Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for St. Cloud, Minnesota.
Gardening in St. Cloud
Central Minnesota's river city sits where the prairies meet the forests. St. John's University and the surrounding Stearns County farms create a productive agricultural community.
Zone 4a with 138 frost-free days. The Mississippi River runs through — yes, the Mississippi starts in Minnesota — providing valley fertility. Genuine northern cold with long summer days.
Central Minnesota's German Catholic farming heritage shows up in organized, productive gardens. The St. Cloud area's agricultural knowledge base is deep and generously shared.
What This Means for St. Cloud Gardeners
The average last spring frost in St. Cloud is around May 10, and the average first fall frost arrives around September 25. That gives you approximately 138 frost-free days to work with.
138 frost-free days means every warm day counts. Focus on cold-hardy crops that thrive in your moderate temperatures: kale, lettuce, peas, radishes, potatoes, and root vegetables. For warm-season crops, choose only the shortest-season varieties (sub-65-day tomatoes, 55-day beans) and start everything indoors. Season extension — row covers, cold frames, plastic mulch — isn't a luxury here, it's essential infrastructure.
These dates are based on NOAA 30-year Climate Normal data for the St. Cloud area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in St. Cloud
With 138 frost-free days, St. Cloud gardeners need to plan strategically — start warm-season crops indoors and choose short-season varieties. Cool-season crops are your strength, thriving in the moderate temperatures that define your growing window. Recommended starting points: kale, lettuce, peas, carrots, potatoes, radishes, garlic, and short-season tomatoes.
See the full Minnesota planting guide for all 40 plants: Minnesota Planting Calendar. Or enter your zip code for exact planting dates personalized to St. Cloud.
More About Zone 4A
St. Cloud is in USDA Hardiness Zone 4A, which means average annual extreme minimum temperatures between -30°F to -25°F. View the full Zone 4A planting guide.
See the complete planting calendar for Minnesota: Minnesota Planting Calendar.
Other Cities in Minnesota
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the St. Cloud area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within St. Cloud (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Start everything possible indoors — your 138-day season doesn't leave room for a slow start. Direct sow only the fastest, hardiest crops (radishes, lettuce, peas) 3-4 weeks before last frost (May 10). Choose short-season varieties for warm crops. Enter your zip code for exact dates.