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When to plant fall potatoes in Missouri is typically around late July to mid-August.
Getting the timing right for when to plant fall potatoes in Missouri is the secret to a successful second harvest.
Missouri gardeners know that spring potatoes are a given, but fall potatoes give you a whole new crop before winter sets in.
If you’ve been wondering when to plant fall potatoes in Missouri, the short answer is about 90 to 110 days before your first expected frost.
In most parts of Missouri, that first frost arrives between late September and mid-October, so you’re looking at a planting window that starts in late July.
The timing matters because fall potatoes need enough warm weather to sprout and grow, but they also need cooler nights to form good tubers.
When you plant fall potatoes in Missouri, you’re essentially racing the calendar to get them in the ground before the heat of summer peaks.
In this post, we’ll dig into the specifics of when to plant fall potatoes in Missouri, including regional differences, soil temps, and variety choices.
Let’s get those spuds in the ground at the perfect moment.
When To Plant Fall Potatoes In Missouri: The Core Timing
The best time to plant fall potatoes in Missouri is late July for northern areas and early August for southern regions.
Missouri spans USDA hardiness zones 5b in the north to 7b in the southeast, so your exact planting date shifts with your location.
For northern Missouri, plant fall potatoes between July 20 and August 1.
For central Missouri, aim for July 25 to August 5.
For southern Missouri, you can push planting to August 1 through August 15.
The reason for this spread is that fall potatoes need about 90 days of growing time before frost kills the vines.
If you plant fall potatoes too late, they won’t have enough time to mature and you’ll end up with tiny, underdeveloped tubers.
If you plant them too early, the intense July heat can stress the seed pieces and cause them to rot before they even sprout.
1. Count Back From Your First Frost Date
The most reliable way to figure out when to plant fall potatoes in Missouri is to count backward from your first frost date.
Most of Missouri’s first frost arrives between September 25 and October 15.
Take your local frost date and subtract 90 to 110 days.
That gives you your planting window for fall potatoes.
For example, if your first frost is October 1, you’d plant fall potatoes around July 1 to July 15.
But wait, that seems earlier than the late July window we mentioned, right?
The trick is that fall potatoes can handle a light frost without dying, so you can push the planting later than the full 110-day count.
In practice, Missouri gardeners plant fall potatoes about 12 to 14 weeks before the first frost, which lands in that late July to mid-August range.
2. Soil Temperature Is Just As Important
When to plant fall potatoes in Missouri also depends on soil temperature, not just the calendar date.
Potato seed pieces sprout best when soil temperatures are between 60°F and 70°F.
In late July, Missouri soil often sits in the high 70s or even 80s, which is too warm for ideal sprouting.
However, fall potatoes are a bit more forgiving than spring ones because the soil is cooling down as the weeks pass.
To combat hot soil, you can plant fall potatoes a bit deeper, around 4 to 6 inches, to keep the seed pieces cooler.
You can also water the soil a couple of days before planting to lower the temperature.
And mulching right after planting can help insulate the soil and hold in moisture.
3. Choose Fast-Maturing Varieties For Fall
When you plant fall potatoes in Missouri, you need varieties that mature quickly.
Look for early or mid-season potatoes that are ready in 70 to 90 days, not the long-season types that need 120 days.
Great choices for fall potatoes in Missouri include Yukon Gold, Red Norland, and Kennebec.
These varieties handle the transition from warm to cool weather really well.
Avoid late-season storage potatoes like Russet Burbank for fall planting because they simply won’t have enough time.
You want fall potatoes that bulk up fast before the first frost hits.
Why Planting Fall Potatoes In Missouri Works So Well
Planting fall potatoes in Missouri is a smart move because the cooler autumn air actually improves tuber quality.
Potato plants thrive in daytime temps of 60°F to 70°F and nighttime temps of 50°F to 60°F.
Missouri’s September days often give you exactly that sweet spot.
When you plant fall potatoes in Missouri, the tubers develop during a period of decreasing daylight, which signals them to bulk up rather than put energy into foliage.
This means your fall potatoes often end up with better texture and flavor than spring ones.
Also, fall planting avoids the early summer heat that can cause knobby, misshapen spuds.
1. Higher Survival Rate For Seed Pieces
Another reason to plant fall potatoes in Missouri is that seed pieces are less likely to rot than in spring.
Spring planting happens in wet, cool soil, which can lead to rot if we get a rainy stretch.
By late July, Missouri soil is typically drier and warmer, so seed pieces cure quickly.
Just make sure your soil drains well, and you’ll see strong sprouting within two weeks.
2. You Get A Second Harvest Without Extra Space
When you plant fall potatoes in Missouri, you can reuse the same bed you used for spring peas or lettuce.
Fall potatoes are a great rotation crop because they break up soil and add organic matter as they grow.
By the time October rolls around, you’ll be pulling fresh potatoes right before your garden goes dormant.
That’s a satisfying end to the growing season, and you didn’t need to add any new garden beds.
How To Prepare Your Soil For Fall Potatoes
Before you plant fall potatoes in Missouri, take a little time to get the soil ready.
Potatoes prefer loose, well-drained soil with a pH between 5.0 and 6.5.
If your soil is heavy clay, mix in compost or aged manure to improve drainage.
Fall potatoes also need consistent moisture, so adding a 2-inch layer of straw mulch after planting helps retain water.
You can also apply a balanced fertilizer like 10-10-10 at planting time, but don’t overdo nitrogen because that leads to lush vines and small tubers.
Water deeply once a week, and more often during dry spells in August.
1. Chitting Your Seed Potatoes Speeds Things Up
To get a head start on when to plant fall potatoes in Missouri, you can chit your seed potatoes.
Chitting simply means letting them sprout in a bright, cool spot before planting.
About two weeks before you plan to plant fall potatoes, place seed pieces in an egg carton with the eyes facing up.
When the sprouts are about half an inch long, they’re ready to go in the ground.
This can shave a week or two off the growing time, which is crucial for a fall crop.
2. Cut And Cure Your Seed Pieces
If you’re using whole potatoes, cut them into pieces with at least one or two eyes each.
Let those cut pieces cure for a day or two before planting fall potatoes.
Curing helps the cut surface callus over and prevents rot in warm soil.
This small step can make a big difference in how well your fall potatoes perform.
So, When To Plant Fall Potatoes In Missouri?
When to plant fall potatoes in Missouri comes down to a simple rule: aim for late July to mid-August.
You’ll want to plant fall potatoes about 12 to 14 weeks before your first expected frost.
Northern Missouri gardeners should target late July, while southern Missouri folks can wait until early August.
The exact timing depends on your local frost date, soil temperature, and the variety you choose.
When you plant fall potatoes in Missouri with fast-maturing varieties and cool soil in mind, you’ll enjoy a bountiful harvest in October.
Just remember to keep them watered, mulched, and monitor for pests like potato beetles.
Now you know exactly when to plant fall potatoes in Missouri, so get those seed pieces ready and enjoy your second crop.
Happy digging, and here’s to a crisp autumn full of homegrown spuds.