Manhattan, KS Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Manhattan, Kansas.
Gardening in Manhattan
The Little Apple is home to K-State — one of the premier agricultural universities in the world. Manhattan gardeners have access to growing expertise that most cities can't match.
Zone 6a with 183 frost-free days. The Flint Hills transition creates interesting soil — prairie upland is rocky, river bottom is fertile. K-State's research plots are the most sophisticated gardens in the state.
K-State's agricultural heritage is Manhattan's identity. The extension service, the campus gardens, and the surrounding Flint Hills farming community create a knowledge-rich growing environment.
What This Means for Manhattan Gardeners
The average last spring frost in Manhattan is around April 15, and the average first fall frost arrives around October 15. That gives you approximately 183 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 Manhattan 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 Manhattan
Manhattan's 183-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 Kansas planting guide for all 40 plants: Kansas Planting Calendar. Or enter your zip code for exact planting dates personalized to Manhattan.
More About Zone 6A
Manhattan is in USDA Hardiness Zone 6A, which means average annual extreme minimum temperatures between -10°F to -5°F. View the full Zone 6A planting guide.
See the complete planting calendar for Kansas: Kansas Planting Calendar.
Other Cities in Kansas
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Manhattan 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 Manhattan (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 183-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.