Lafayette, IN Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Lafayette, Indiana.
Gardening in Lafayette
Purdue University's hometown has engineering-caliber agricultural research. The Wabash River valley provides fertile growing conditions.
Zone 5b with 168 frost-free days. The Wabash Valley's alluvial soil is deep and fertile. Purdue's agricultural expertise is a community resource.
Purdue's agricultural programs are world-class. Lafayette gardeners have access to growing advice from one of America's premier land-grant universities.
What This Means for Lafayette Gardeners
The average last spring frost in Lafayette is around April 25, and the average first fall frost arrives around October 10. That gives you approximately 168 frost-free days to work with.
At 168 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 Lafayette 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 Lafayette
Lafayette's 168-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 Indiana planting guide for all 40 plants: Indiana Planting Calendar. Or enter your zip code for exact planting dates personalized to Lafayette.
More About Zone 5B
Lafayette 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 Indiana: Indiana Planting Calendar.
Other Cities in Indiana
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Lafayette 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 Lafayette (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 25) to maximize your 168-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.