Cedar Rapids, IA Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Cedar Rapids, Iowa.
Gardening in Cedar Rapids
The City of Five Seasons sits on the Cedar River in the heart of Iowa's most productive farmland. The surrounding black prairie soil is some of the most fertile on earth.
Zone 5a with 160 frost-free days. The Cedar River valley provides rich bottomland that floods occasionally — gardeners in low-lying areas learned this lesson in 2008. Upland prairie soil is naturally deep and fertile.
NewBo City Market anchors Cedar Rapids' growing food scene. The Czech and Slovak heritage that defines the city's culture extends to productive kitchen gardens.
What This Means for Cedar Rapids Gardeners
The average last spring frost in Cedar Rapids is around April 28, and the average first fall frost arrives around October 5. That gives you approximately 160 frost-free days to work with.
At 160 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 Cedar Rapids 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 Cedar Rapids
Cedar Rapids's 160-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 Cedar Rapids.
More About Zone 5A
Cedar Rapids is in USDA Hardiness Zone 5A, which means average annual extreme minimum temperatures between -20°F to -15°F. View the full Zone 5A 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 Cedar Rapids 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 Cedar Rapids (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 28) to maximize your 160-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.