Yuma, AZ Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Yuma, Arizona.
Gardening in Yuma
America's sunniest city grows more winter lettuce than anywhere else in the country. Yuma's agricultural heritage is its identity — the city literally feeds America from November through March.
Zone 10a with 334 frost-free days. Summer temperatures regularly exceed 115°F, but the Colorado River provides irrigation water and the winter growing season is phenomenal. Yuma's commercial vegetable farms prove this climate produces world-class food.
When you eat a salad in January, the lettuce probably came from Yuma. Home gardeners benefit from the same extraordinary winter growing conditions that support the commercial industry. Summer is strictly for heat-loving desert plants.
What This Means for Yuma Gardeners
The average last spring frost in Yuma is around January 15, and the average first fall frost arrives around December 15. That gives you approximately 334 frost-free days to work with.
Yuma's growing season is essentially year-round. Frost is a rare event, not a seasonal boundary. Traditional cool-season crops grow through your mild winter, while tropical and subtropical plants thrive permanently outdoors. Your challenge isn't length of season — it's managing summer heat and humidity. Plant warm-season vegetables from September through February and shift to heat-tolerant crops for the summer months.
These dates are based on NOAA 30-year Climate Normal data for the Yuma 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 Yuma
With 334 frost-free days, Yuma can grow nearly anything — including tropical and subtropical plants that most of the country can only dream about. Your prime vegetable season runs from fall through spring; summer is for heat-lovers like okra, sweet potatoes, and peppers. Recommended starting points: cherry tomatoes, jalapeños, okra, sweet potatoes, basil, collard greens, tomatillos, and lemongrass.
See the full Arizona planting guide for all 40 plants: Arizona Planting Calendar. Or enter your zip code for exact planting dates personalized to Yuma.
More About Zone 10A
Yuma is in USDA Hardiness Zone 10A, which means average annual extreme minimum temperatures between 30°F to 35°F. View the full Zone 10A planting guide.
See the complete planting calendar for Arizona: Arizona Planting Calendar.
Other Cities in Arizona
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Yuma 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 Yuma (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
You can plant cool-season crops (lettuce, kale, broccoli) from December 15 through January 15 — your cool season is your primary vegetable season. Warm-season crops like tomatoes and peppers go out in early spring. Tropical plants grow year-round. Enter your zip code for exact dates for every plant.