Jefferson City, MO Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Jefferson City, Missouri.
Gardening in Jefferson City
Missouri's capital sits on the Missouri River, where the state's diverse geography — Ozarks to the south, prairie to the north — converges.
Zone 6a with 183 frost-free days. The Missouri River bottomland is exceptionally fertile. The capitol city's bluff-top location creates drainage patterns and microclimates that vary from the river bottom to the uplands.
Missouri's extension service, headquartered through Mizzou, provides excellent growing resources. The capital city's farmers market connects government workers to the state's agricultural heritage.
What This Means for Jefferson City Gardeners
The average last spring frost in Jefferson City 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 Jefferson City 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 Jefferson City
Jefferson City'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 Missouri planting guide for all 40 plants: Missouri Planting Calendar. Or enter your zip code for exact planting dates personalized to Jefferson City.
More About Zone 6A
Jefferson City 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 Missouri: Missouri Planting Calendar.
Other Cities in Missouri
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Jefferson City 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 Jefferson City (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.