Harvest guide
When to Plant Peppers (Frost Timing by Zone)
Start pepper seeds indoors 8 to 10 weeks before your last spring frost, then set transplants out 1 to 2 weeks after the frost passes, once soil hits 60 to 65 F and nights stay above 50 to 55 F.
Days to maturity
60–90days
Ready when
Full size and color; firm and glossy
The short answer
Start pepper seeds indoors 8 to 10 weeks before your last spring frost. Then set transplants outside 1 to 2 weeks after the frost passes, once the soil reaches 60 to 65 F and nights stay above 50 to 55 F. Peppers are frost-tender, so cold soil and a late frost both stall the crop.
Peppers run on a two-step clock. You start the seeds indoors in late winter, then move the young plants outside well after the last frost, once the ground has warmed. Rush either step and the plants sulk. This guide covers the timing by zone, the soil temperature to wait for, and the mistakes that cost a season.
When to plant peppers by zone
The target is the same everywhere: get transplants into warm soil, not cold. Iowa State Extension sets the benchmark at mid-May for central Iowa, a week earlier in the south of the state and a week later in the north. Colder zones warm up later, so they plant later.
The windows below are starting points, not deadlines. Watch your own last-frost date and the soil thermometer.
| Region / zone | Start seeds indoors | Transplant outside |
|---|---|---|
| Cold (zones 3–4) | Late Feb – March | Late May – early June |
| Temperate (zones 5–6) | March – early April | Mid-May – early June |
| Warm (zones 7–8) | Feb – March | Late April – May |
| Hot (zones 9–10) | Jan – Feb | March – April |
Count back from your frost date to set the indoor sowing day. If your last frost lands around May 15, start seeds in the first half of March.
How to tell it is time to plant out
Three signals line up before peppers should go in the ground. Frost has to be done, the soil has to be warm, and the nights have to hold.
- The last spring frost has passed, plus 1 to 2 weeks of cushion.
- Soil temperature at planting depth is 60 to 65 F or warmer.
- Nighttime lows stay above 50 to 55 F.
Ohio State Extension says to plant warm-weather crops like peppers when the soil is 60 F or more. University of Maryland Extension wants soil above 60 F and air above 50 F, including at night, before transplanting. Warmer is better. University of Georgia Extension notes peppers do best with soil closer to 70 F.
Pro tip
Push a soil thermometer 2 to 3 inches into the bed first thing in the morning for a few days. Use the morning low, not the afternoon high, since that is what the roots feel overnight. If the morning reading holds at 60 F or above, the soil is ready. Black plastic or landscape fabric laid down a week ahead warms cold spring soil faster and buys you an earlier planting date.
Starting seeds indoors: the 8-to-10-week head start
Peppers are slow off the line, which is why almost nobody direct-sows them outdoors in most of the US. Start seeds 8 to 10 weeks before your last frost so you have a sturdy transplant ready when the soil warms.
Germination needs heat. Iowa State Extension lists pepper germination at 60 F minimum, 80 F optimum, and 90 F maximum soil temperature, so a seedling heat mat earns its keep. Cool soil leaves seeds sitting for weeks or rotting.
| Pepper type | Days to maturity (from transplant) | Note |
|---|---|---|
| Sweet / bell | 60–90 days | Start at the 8-week mark |
| Hot (jalapeño, cayenne, etc.) | 70–120 days | Start at the 10-week mark |
The day ranges vary by variety and season, so treat them as a guide. Hot peppers generally take longer than sweet ones, which is why the slow varieties get the earlier start. For the harvest side of that window, see when to harvest peppers.
Hardening off before transplant
Do not move seedlings straight from a warm windowsill into the garden. They need about a week to toughen up, or the sun and wind will scorch them.
Set the plants outside in shade for an hour or two on day one, then add time and sun each day across 7 to 10 days. By the end they handle a full day out, and transplant shock is mild.
This step is why the cushion after frost matters. The hardening-off week overlaps the wait for warm soil, so neither holds you up.
Spring vs fall: when a second planting makes sense
For most US gardeners, one spring planting is the whole season. Peppers are perennials grown as annuals, and a healthy plant keeps setting fruit from midsummer until the first fall frost stops it.
A fall crop only pays off where the warm season is long. In hot coastal areas, Clemson Extension recommends a fall pepper planting from July 10 to August 10. North of the warm zones, there is not enough heat left after midsummer for a second crop to ripen.
Common mistake
The classic pepper mistake is planting too early into cold soil. A warm afternoon in April tempts everyone, but the soil underneath is still cold, and peppers that go into ground below 60 F just sit there, yellow, and stall. Worse, a late frost can kill them outright. University of Minnesota Extension says to wait until nighttime lows stay above 50 F. Below about 60 F at night, peppers drop their blossoms and set little fruit, so patience early pays off all summer.
Get the spacing right before you plant
Once the timing is sorted, give each plant room. Crowded peppers compete for light and air, which invites disease and shrinks the crop.
Work out the layout before you set plants in. The pepper spacing guide walks the in-row and row spacing, and the plant spacing calculator counts how many fit your exact bed. While you are planning, the pepper companion plants guide covers what to set nearby. Peppers share the warm-season rhythm of many summer crops, the same patient timing behind when to plant garlic on the cool-season side.
Your next step
Plant peppers on the soil's schedule, not the calendar's. Start seeds indoors 8 to 10 weeks before your last frost, then transplant 1 to 2 weeks after the frost passes, once the soil holds 60 to 65 F and nights stay above 50 to 55 F.
Ready to lay out the bed? Open the plant spacing calculator and set peppers at 18 inches so each plant has room to fruit.
Common questions
What month is best to plant peppers?
It depends on your frost date, not the calendar. Most US gardeners transplant peppers outdoors in May or early June, 1 to 2 weeks after the last spring frost. Iowa State Extension gives mid-May for central Iowa, one week earlier in the south and one week later in the north. Warm zones 8 to 10 can plant in April.
When should I start pepper seeds indoors?
Start seeds 8 to 10 weeks before your last spring frost. Peppers are slow to germinate and grow, so they need a head start. Iowa State Extension lists 60 F as the minimum germination soil temperature and 80 F as the optimum, so use a heat mat to keep the tray warm. Hot peppers can be started at the earlier end of that range.
How warm does the soil need to be to plant peppers?
Wait until the soil reaches at least 60 to 65 F before setting peppers out. Ohio State Extension says to plant warm-weather crops like peppers when soil is 60 F or more, and University of Georgia Extension notes peppers do best closer to 70 F. Cold soil stalls the plants and can cause blossom drop later.
Can peppers go outside before the last frost?
No. Peppers are frost-tender and a single frost can kill a young transplant. Wait until all danger of frost has passed, then add 1 to 2 weeks. University of Minnesota Extension says to transplant only after nighttime lows stay above 50 F. Below about 60 F at night, peppers set little or no fruit.
Can I plant a second crop of peppers in fall?
Only in warm southern zones. A spring planting carries most gardeners through fall, since peppers keep producing until frost. In hot coastal areas, Clemson Extension recommends a fall pepper planting from July 10 to August 10. In cold zones there is not enough warm season left for a second crop.
Sources
Agronomic claims in this guide are checked against these primary sources.
- Growing Peppers in the Home Garden — Iowa State University Extension
- Growing Peppers in the Home Garden — Ohio State University Extension
- Growing peppers in home gardens — University of Minnesota Extension
- Peppers — University of Maryland Extension
- Pepper — Clemson Cooperative Extension
Keep reading
When to Harvest Peppers (Green vs Ripe)
Bell peppers are full size and firm at green stage around 60 to 70 days, and fully ripe in red, yellow, or orange around 80 to 90 days. Here are the cues, the cut-don't-pull method, and the green-versus-ripe trade-off.
Read →Pepper Companion Plants (and What to Keep Apart)
Good neighbors for peppers include basil, onions and garlic, carrots, lettuce and spinach, nasturtium, and tomatoes. Keep fennel and heavy-feeding brassicas apart. The reliable wins are spacing, pollinator support, and not crowding, not flavor magic.
Read →When to Plant Garlic (Fall Timing by Zone)
Plant garlic in fall, about 3 to 6 weeks before the ground freezes, so roots set before winter. That lands mid-September to November across most US zones. Plant cloves 2 inches deep, pointy end up, 4 to 6 inches apart.
Read →When to Plant Zucchini (Frost + Soil Temp Timing)
Plant zucchini after your last spring frost, once the soil hits at least 60 F (ideally 65 to 70 F). Direct-sow seeds 1/2 to 1 inch deep, or set out transplants started 2 to 4 weeks earlier. Warm zones get a second fall crop.
Read →When to Plant Tomatoes (Frost + Soil Temp by Zone)
Set tomato transplants out 1 to 2 weeks after your last spring frost, once soil hits at least 60 F. Start seeds indoors 6 to 8 weeks before that frost date. Cold soil stalls them, so wait for warmth.
Read →When to Plant Swiss Chard (Spring and Fall Timing)
Plant swiss chard 2 to 4 weeks before your last spring frost, once the soil hits 40°F. Sow again 3 to 4 weeks before the first fall frost. Seeds go half an inch to an inch deep.
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