When to Plant Garden in Missouri: Spring vs Fall Timing for Hardiness Zones 5b-6a

Planting your garden in Missouri at the right time means the difference between a bountiful harvest and a sad, wilted disappointment 🌱 — and the clock starts ticking after the last frost, usually around mid-April for most of the state.

Missouri gardeners know timing is everything—plant too early and risk frost damage, too late and miss the growing season. For Hardiness Zones 5b-6a, mastering the perfect planting window ensures your tomatoes, flowers, and veggies thrive year after year.

Spring planting kicks off as soon as the soil warms to 50°F, but not all crops are created equal. Cool-season greens like spinach and root veggies like carrots can handle early starts, while heat-lovers like peppers and basil need to wait until late May or early June.

Here’s how to align your planting schedule with Missouri’s climate—including fall planting tips for a second harvest, soil prep secrets, and what to watch for when northern and southern Missouri’s microclimates don’t quite match.

Missouri planting calendar: exact dates for spring vs fall crops by Zone

Missouri’s USDA Zones 5b-6a create a unique growing window where spring warmth and fall mildness extend your harvests. Unlike northern states, Missouri’s last spring frost typically arrives between April 15-30, while first fall frost hits October 15-30, depending on your region.

St. Louis (Zone 6a) enjoys a 2-week longer growing season than northern Missouri (Zone 5b), so adjust your schedule accordingly.

For cool-season crops like lettuce and peas, I start seeds indoors 6-8 weeks before the last frost. Warm-season favorites such as tomatoes and peppers need soil temperatures above 60°F—wait until May 1-15 for most areas.

Fall planting begins 6-8 weeks before your first frost, with broccoli and kale thriving until hard freezes.

Missouri’s microclimates matter: Kansas City’s Zone 5b freezes earlier than St. Louis’ Zone 6a. Use these frost-ready dates as your guide, but always monitor your local weather. A 10-day heatwave in March doesn’t mean frost is gone—wait for consistent warmth before planting frost-sensitive crops like basil or cucumbers.

Pro Tip: Test your soil temperature with a thermometer—50°F+ for peas, 60°F+ for tomatoes. If your soil is cold, wait or use black plastic mulch to warm it faster. In fall, aim for 55-65°F soil for optimal root growth.

Regional Adjustments:

• Northern Missouri (Zone 5b): Last frost April 20-30, first frost October 10-20
• Central Missouri (Zone 6a): Last frost April 10-20, first frost October 20-30
• St. Louis (Zone 6a): Last frost April 5-15, first frost October 25-Nov 5

Missouri’s fall planting is often overlooked but can yield sweeter, hardier crops than spring. Start broccoli and cabbage in early August for a November harvest before hard frosts.

For warm-season crops like tomatoes, extend your season by planting heat-tolerant varieties (e.g., ‘Celebrity’ tomatoes) in late June with shade cloth.

Don’t forget succession planting! In spring, sow lettuce every 2 weeks from April to July for continuous harvests. In fall, plant radishes in August for a quick crop before winter sets in. This space-saving trick maximizes your garden’s productivity.

For container gardening, adjust timelines slightly—pots warm up faster in spring but also cool down quicker in fall. Move containers to protected spots (e.g., near south-facing walls) to extend the season by 2-3 weeks. Herbs like thyme

Best crops to plant in Missouri spring vs fall (with frost tolerance guide)

Missouri’s spring and fall seasons offer two prime planting windows, but not all crops handle frost the same way. Cool-season crops like kale and spinach thrive when temperatures dip, while warm-season plants like tomatoes need frost-free soil to germinate.

Knowing which plants to prioritize in each season—and how they tolerate light freezes—can mean the difference between a bountiful harvest and wasted effort.

In spring, focus on cool-hardy vegetables that can handle light frost (28°F or higher) while establishing roots. Fall planting works best for crops that mature quickly before the first hard frost (around 24°F in Missouri’s Zone 5b-6a).

Below, I’ve ranked the top vegetables, herbs, and flowers by frost tolerance and yield potential, so you can plan your garden with confidence.