When to Plant in Missouri

Missouri sits at the crossroads of several climate regions, giving gardeners in different parts of the state distinct growing experiences. The Bootheel in the southeast has a long, warm season, while northern Missouri near the Iowa border stays cooler with later frosts.

The state's deep, fertile soils — especially in the river valleys — are excellent for vegetable gardening. Missouri's reliable summer rainfall means less irrigation is needed compared to western states, though drought years do occur.

Common Mistakes

Planting too early after a warm February — Missouri springs are notorious for late cold snaps through mid-April.
Not mulching to conserve moisture during hot, dry July and August spells.
Ignoring the Bootheel's longer season — gardeners in the southeast can start weeks earlier than Kansas City or St. Louis.
Overlooking fall planting — Missouri's moderate autumn temperatures support excellent cool-season crops.

FAQ

What is the last frost date?

The last frost date is the typical date in spring when your area has its final frost. After this date, it's generally safe to plant warm-season crops outdoors.

When should I start tomatoes indoors in Missouri?

Start tomato seeds indoors about 6–8 weeks before your last frost date. In the St. Louis and Kansas City areas, that's typically early to mid-March.

Can I plant before the last frost?

Yes — cool-season crops like lettuce, peas, spinach, and broccoli can handle light frost and should be planted 4–6 weeks before your last frost date.

Why does timing vary so much within Missouri?

Missouri spans from the Ozark highlands to the Mississippi floodplain. The Bootheel is warmer and has a longer season, while northern Missouri has later last frosts.

What if I live in a frost-free area?

Missouri doesn't have frost-free areas, but the Bootheel region has the longest growing season in the state. Enter your zip code in the app for exact dates.

How does Plan My Garden create my schedule?

You enter your zip code, and we look up your local frost dates. Then based on the crops you pick, we calculate when to start seeds, transplant, and harvest — personalized to your location.