Logan, UT Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Logan, Utah.
Gardening in Logan
Utah State University's Cache Valley hometown has cold winters but exceptional agricultural research and fertile valley soil.
Zone 5b with 141 frost-free days. The Cache Valley is a frost pocket — cold air settles in the basin. But the deep alluvial soil from the ancient Lake Bonneville is incredibly fertile.
USU's agricultural programs are world-class. The Cache Valley's dairy heritage extends to food gardens that benefit from the same rich soil.
What This Means for Logan Gardeners
The average last spring frost in Logan is around May 10, and the average first fall frost arrives around September 28. That gives you approximately 141 frost-free days to work with.
At 141 days, you're working with a compressed but productive window. Choose varieties by their days-to-maturity number — anything under 75 days is safe, 75-90 requires indoor starting, and 90+ is a calculated risk. The tradeoff: your cool, moderate summers are excellent for crops that heat-zone gardeners struggle with. Your lettuce doesn't bolt in June. Your peas produce for weeks longer. Cool-season crops are your superpower.
These dates are based on NOAA 30-year Climate Normal data for the Logan 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 Logan
With 141 frost-free days, Logan 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 Utah planting guide for all 40 plants: Utah Planting Calendar. Or enter your zip code for exact planting dates personalized to Logan.
More About Zone 5B
Logan is in USDA Hardiness Zone 5B, which means average annual extreme minimum temperatures between -15°F to -10°F. View the full Zone 5B planting guide.
See the complete planting calendar for Utah: Utah Planting Calendar.
Other Cities in Utah
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Logan 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 Logan (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Start everything possible indoors — your 141-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.