Planting
Planting a fall garden in Missouri at the right time means the difference between a bountiful harvest and a frost-killed disappointment.
Missouri’s unpredictable fall weather can make or break your garden—plant too early, and a late frost wipes out your harvest. But with the right timing, you can grow hardy crops like kale, spinach, and radishes until winter.
Here’s your zone-by-zone guide to planting Fall Garden Plants (General) 🌱 without the frost risk.
In Missouri’s 5b-6b zones, the window for planting opens in mid-August and closes by mid-October, depending on your exact location. The key is aligning your planting with the first frost dates—typically between October 20 and November 15—so your crops mature before the cold sets in.
Below, I’ll break down the exact planting dates for your zone, the fastest-growing crops for a short season, and how to protect your garden from late frost surprises—so you can enjoy fresh harvests straight through November.
Missouri fall planting dates by hardiness zone (avoid frost with these exact timelines)
Missouri’s fall planting window is short but sweet—just 6-8 weeks before the first frost. To avoid losing your harvest to 28°F temperatures, timing is everything. The state spans USDA zones 5a-7a, meaning northern Missouri (like St. Joseph) freezes earlier than southern areas (like Poplar Bluff).
I’ll break down the exact planting deadlines for your zone, plus soil temp rules to ensure your seeds sprout instead of rot.
First, check your average first frost date—this is your planting deadline anchor. For example, in zone 5a, frost hits by October 15, while zone 7a gardens can push crops until November 1.
Always plant 4-6 weeks before this date for a full harvest. Pro tip: Use Missouri State University’s frost map to pinpoint your local cutoff.
Now, let’s talk soil temperature. Most cool-season crops need soil at 45-75°F to germinate. Test your soil with a soil thermometer—if it’s below 50°F, wait 1-2 weeks or use row covers to warm it.
In zone 6a, soil cools faster, so aim for mid-August planting for broccoli and carrots.
Here’s the golden rule: Leafy greens (like spinach and lettuce) tolerate light frosts, while root crops (like radishes) need consistent warmth to mature. Plant radishes by September 1 in zone 5a for a harvest before frost, but in zone 7a, you’ve got until October 15.
| Zone | First Frost Date | Ideal Planting Window | Soil Temp for Germination | Zero-Frost Risk Crops |
|---|---|---|---|---|
| 5a (St. Joseph, Kirksville) | Oct 15 | Aug 20 - Sep 15 | 50-70°F | Kale, Spinach, Radishes, Carrots |
| 6a (Columbia, Springfield) | Oct 25 | Aug 30 - Sep 25 | 45-65°F | Broccoli, Lettuce, Swiss Chard, Beets |
| 6b (Jefferson City, Sedalia) | Nov 1 | Sep 5 - Oct 5 | 40-60°F | Brussels Sprouts, Turnips, Arugula, Peas |
| 7a (Poplar Bluff, Cape Girardeau) | Nov 15 | Sep 15 - Oct 15 | 40-55°F | Cabbage, Collards, Spinach, Radishes |
| All Zones | - | Last Chance: 2 Weeks Before Frost | Cold-Hardy Seeds Only | Kale, Spinach, Garlic, Onions |
*Adjust for microclimates (e.g., south-facing beds warm up faster).
For transplants (like broccoli or cauliflower starts), follow the "49-day rule": Subtract 49 days from your frost date to find your
10 Fastest-growing fall crops for Missouri’s short season (and how to extend their harvest)
Missouri’s short fall season demands fast-growing crops that thrive in cooler temps. The key is selecting cold-hardy varieties with 30-50 days to maturity—just enough time to harvest before winter sets in. These crops also include cut-and-come-again greens, perfect for extending your harvest through light frosts.
For maximum yield, pair these crops with succession planting—sowing new seeds every 2-3 weeks. This strategy ensures a steady supply of fresh produce, even as temperatures drop. Below are the top 10 fastest-growing fall crops for Missouri, ranked by speed, hardiness, and ease of care.
🌱 numbered-highlights
- 🥕 Radishes – 25-30 days, risk-reward: 9/10 – Fastest crop, thrives in cool soil (50-65°F). Plant every 2 weeks for continuous harvest.
- 🍃 Arugula – 30-40 days, risk-reward: 8/10 – "Cut-and-come-again" green; harvest outer leaves to encourage regrowth.
- 🥬 Spinach – 35-45 days, risk-reward: 8/10 – Prefers 50-60°F soil; tolerates light frost. Succession plant every 3 weeks.
- 🌿 Swiss Chard – 40-50 days, risk-reward: 9/10 – Hardy to 20°F; harvest leaves as needed for months. Space 12 inches apart.
- 🥦 Broccoli – 50-60 days, risk-reward: 7/10 – Plant 6-8 weeks before first frost; harvest heads before they flower. Needs full sun.
- 🥬 Lettuce (Leaf Varieties) – 30-40 days, risk-reward: 8/10 – Ideal for partial shade; sow every 2 weeks for continuous harvest.
- 🌱 Kale – 50-60 days, risk-reward: 9/10 – Cold-hardy to 15°F; sweeter after frost. Space 12-18 inches apart.
- 🥕 Carrots – 60-70 days, risk-reward: 7/10 – Plant in loose, stone-free soil; thin seedlings to 2-3 inches apart.
- 🌿 Turnips – 40-50 days, risk-reward: 8/10 – Edible greens and roots; harvest greens first to extend harvest.
- 🥬 Peas (Sugar Snap) – 60-70 days, risk-reward: 7/10 – Plant trellised rows; thrives in cool, moist soil.
To extend your harvest, focus on soil preparation first. Amend your garden beds with compost or aged manure to improve drainage and fertility. These crops prefer well-draining soil with a pH of 6.0-7.0.
For example, radishes and carrots hate compacted soil, so loosen the top 6 inches before planting.
For succession planting, mark your calendar with these key dates: start your first batch of fastest growers (radishes, arugula) in mid-August, then sow new seeds every 2-3 weeks until mid-September. This ensures a steady supply of fresh greens and roots until the first frost.
Pro tip: Use row covers or low tunnels to protect tender crops like lettuce and spinach from unexpected late frosts. Even a light frost (28-32°F) can sweeten greens like kale and Swiss chard, making them even more flavorful.