Salt Lake City, UT Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Salt Lake City, Utah.
Gardening in Salt Lake City
Salt Lake's gardening heritage goes back to the pioneer settlers who literally made the desert bloom. That DIY, self-reliance spirit still drives the city's food garden culture — augmented now by a tech-savvy population that's as likely to optimize their drip system with an app as with a wrench.
The Wasatch Mountains create rain shadow conditions — SLC gets only 16 inches of rain annually, making irrigation essential. But the mountain snowmelt fills the water system, and the valley's alluvial soils are deep and fertile when watered. Your 188-day growing season is solid, and the intense mountain sun drives excellent production. The lake effect from the Great Salt Lake occasionally moderates temperatures along the western valley.
Jazz fans know about making noise in a market nobody expected to compete — SLC gardeners grow food in a desert that nobody expected to be productive. The city's strong canning and food preservation culture (rooted in LDS tradition) means that harvest season involves pressure cookers and mason jars at a scale that would impress any Appalachian grandmother.
What This Means for Salt Lake City Gardeners
The average last spring frost in Salt Lake City is around April 15, and the average first fall frost arrives around October 20. That gives you approximately 188 frost-free days to work with.
A solid, workable season. Most standard vegetable varieties have enough time to mature, though the longest-season crops (like sweet potatoes at 90+ days or large watermelons at 85+ days) need to be started early and chosen carefully. Indoor seed starting isn't optional — it's how you buy the extra weeks that make the difference between a good harvest and a great one.
These dates are based on NOAA 30-year Climate Normal data for the Salt Lake City 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 Salt Lake City
Salt Lake City's 188-day season gives you plenty of time for most vegetables with good planning. Start warm-season crops indoors to maximize your window. Cool-season crops thrive in your spring and fall shoulder seasons. Recommended starting points: tomatoes, peppers, lettuce, carrots, beans, broccoli, garlic, and basil.
See the full Utah planting guide for all 40 plants: Utah Planting Calendar. Or enter your zip code for exact planting dates personalized to Salt Lake City.
More About Zone 7A
Salt Lake City is in USDA Hardiness Zone 7A, which means average annual extreme minimum temperatures between 0°F to 5°F. View the full Zone 7A 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 Salt Lake City 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 Salt Lake City (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Start warm-season seeds indoors 6-8 weeks before your last frost (April 15) to maximize your 188-day window. Direct sow cold-hardy crops like peas and lettuce 3-4 weeks before last frost. Every week of early indoor starting matters at this season length. Enter your zip code for exact dates.