Davenport, IA Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Davenport, Iowa.
Gardening in Davenport
The Quad Cities' Iowa anchor sits on the Mississippi River, where river commerce meets prairie agriculture. The bottomland is extraordinarily fertile.
Zone 5b with 171 frost-free days. The Mississippi River corridor provides moderated temperatures and deep alluvial soil that's been building fertility for millennia.
The Freight House Farmers Market in the Quad Cities draws from both Iowa and Illinois growing traditions.
What This Means for Davenport Gardeners
The average last spring frost in Davenport is around April 22, and the average first fall frost arrives around October 10. That gives you approximately 171 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 Davenport 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 Davenport
Davenport's 171-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 Iowa planting guide for all 40 plants: Iowa Planting Calendar. Or enter your zip code for exact planting dates personalized to Davenport.
More About Zone 5B
Davenport 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 Iowa: Iowa Planting Calendar.
Other Cities in Iowa
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Davenport 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 Davenport (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 22) to maximize your 171-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.