Missouri · zones 5b–7a
When to plant bell peppers in Missouri.
Sow or transplant between May 1 to Jun 22 in a typical year, keyed to Missouri's median last frost around Apr 15. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Bell Peppers dates for a typical Missouri season.
1 · Start indoors
Mar 20 to May 11
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 1 to Jun 22
Keyed to the ~Apr 15 last frost. Sow 0.25" deep, 18" apart.
Harvest
~70 days later
~4 lb per plant over ~8 weeks.
Missouri spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 7a. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Missouri growing notes
Missouri's April can freeze twice. Bell peppers do not forgive that.
Read the soil thermometer, not the calendar
Missouri sits in the weather transition zone, the seam where northern cold fronts and southern humidity collide, and that seam makes spring erratic even after the average last frost date passes in mid-April. A week can open with a night in the high 20s and close with an afternoon near 80, and bell peppers punish that swing harder than tomatoes do: a night that drops into the 50s costs open blossoms outright, and the plant can take 2 to 3 weeks to resume real growth even once the weather turns friendly again.
These go into the garden as transplants, not seed, so take the reading deeper than a seed bed calls for: push a soil thermometer 4 to 6 inches down and wait for three straight mornings holding at 60 degrees or better before transplants go in, usually 2 to 3 weeks after the last frost date, not on it. Black plastic mulch laid 10 days ahead banks several extra degrees of heat, and keeping row cover folded nearby through the first 2 weeks after transplanting is cheap insurance against the one more cold night Missouri's whiplash springs love to deliver after everyone assumes it is over.
Rocky Ozark ground versus river-bottom loam
Where you garden in Missouri changes the prep work more than most states admit. Ozark Plateau soil is thin and studded with chert rock, often just 8 to 10 inches of usable ground over fractured limestone, and peppers set into it without amendment stay stunted and thirsty by midsummer. Missouri and Mississippi river-bottom ground, mostly in the Bootheel and along the Missouri River valley, is deep loam that barely needs coaxing to grow a strong pepper crop.
On rocky ground, work in 3 inches of compost or build an 8-inch raised bed rather than fight the native rock. Space plants 18 inches apart everywhere in the state; that gap gives a plant carrying 4 to 6 ounce fruit the airflow it needs, and a full 2-gallon watering can once a week keeps the shallow Ozark root zone from swinging between soggy and bone dry.
Peppers dodge blight, but not Missouri's other humidity diseases
Missouri's humid summers bring on the early and late blight that hit the state's tomatoes, but pepper is not a host for either one; both stay confined to nightshade relatives that pepper does not share the trait with. Two other problems fill that gap on a pepper plant instead: small, water-soaked leaf spots that darken and drop are bacterial leaf spot, and on ground that holds water after a storm, watch the stem base itself, since Phytophthora crown rot can take a healthy-looking plant down in days once it collapses right where the stem meets the soil. Strip spotted leaves at first sight and let the 18-inch spacing do its job before reaching for a fungicide. Tomato hornworms cross over to pepper foliage too, so one nightly flashlight pass over both crops covers the whole garden.
Every bell pepper is edible green, and Missouri's roughly 188 frost-free days, mid-April to late October, are long enough to ripen a fair share to red, yellow, or orange if you leave them 3 more weeks. A healthy plant carries about 4 pounds of fruit across a season, and picking the first green peppers actually pushes the plant to set more, so a mixed harvest, some green early and some colored late, outproduces waiting for every single fruit to turn.
In Missouri: watch for
The pests that find bell peppers here.
A middle-length season, about 188 frost-free days, means pepper, bell overlaps aphids for a stretch each summer. Check plants every week or two and treat early.
Clusters on new growth, sticky leaves, curling tips. Green peach aphid spreads virus.
Organic fix: Blast with water, then insecticidal soap or neem.
Bacterial leaf spot
Small water-soaked spots that turn brown; badly spotted leaves drop.
Organic fix: Plant resistant varieties, avoid overhead watering, rotate out of nightshades.
Plant wilts and collapses at the soil line after a bed stays soggy.
Organic fix: Plant on raised ground for drainage; remove collapsed plants and do not replant there.
Tiny shot-hole pits peppering young leaves.
Organic fix: Row cover the seedlings; healthy transplants outgrow the damage.
Your season math: Missouri gives bell peppers about 188 frost-free days, and it needs roughly 70 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting bell peppers in Missouri: questions
When should I plant bell peppers in Missouri?+
In a typical Missouri year, sow bell peppers or set out transplants between May 1 to Jun 22, keyed to the state's median last frost around Apr 15. Your exact dates shift with your ZIP code and microclimate.
When do I start bell peppers seeds indoors in Missouri?+
Start seeds inside about 6 weeks before set-out: roughly Mar 20 to May 11 for a typical Missouri season.
What USDA zone is Missouri?+
Missouri spans zones 5b–7a, mostly zone 6. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many bell peppers plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.