In zone 9, plant pepper transplants outside from March 17 to March 24, two to three weeks after your last spring frost, once nights stay above 50 °F. Start seeds indoors from January 6 to January 20, and expect your first peppers from about May 21.
Pepper dates for your ZIP code
Planting times based on university extension guidance (UNH, Cornell, Purdue, Minnesota, Nebraska and UMass Extension). Frost dates from NOAA 1991–2020 U.S. Climate Normals, nearest weather station. Zones derived from the 2023 USDA Plant Hardiness Zone Map data (PRISM Climate Group, Oregon State University). This is not the official USDA Plant Hardiness Zone Map.
Pepper timing in zone 9
| Task | When |
|---|---|
| Start indoors | January 6 – January 20 |
| Transplant outside | March 17 – March 24 |
| First harvest | May 21 – June 12 |
| Harden off seedlings | Over one to two weeks before transplanting |
| Mulch | After planting, with straw, compost or wood chips kept off the stems |
| Water | Deeply and evenly, especially in summer heat |
Most of zone 9 sees its last spring frost between February 16 and March 15, with a typical date of March 3. Peppers need warmer weather than tomatoes, so wait until nights stay above 50 °F even if that is later than the window. The tool above uses the weather station closest to your ZIP code.
Why peppers go out later than tomatoes
Peppers are even more sensitive to cold than tomatoes. Frost kills them, and cool soil and cool nights stop their growth. Seeds germinate best at 80–90 °F, and transplants do best once nighttime lows stay above 50 °F. That is why peppers are set out two to three weeks after the last spring frost.
Best pepper varieties for zone 9
Peppers handle heat better than tomatoes, and in zone 9 they often keep producing into fall:
- Hot peppers such as jalapeño, habanero and Tula thrive in long, hot summers.
- Small-fruited sweet peppers keep setting fruit in heat better than large bells.
- Bell peppers: Big Bertha, Camelot, Colossal and Karma. Expect fewer fruits during the hottest weeks.
How to plant peppers
- Start seeds indoors about eight to ten weeks before your transplant date. A heat mat helps them germinate; once up, grow them at about 70 °F.
- Harden off the seedlings over one to two weeks, starting with a couple of hours of sun in a sheltered spot.
- Transplant on a cloudy day or in the late afternoon to reduce stress.
- Space plants 18 inches apart in rows 30–36 inches apart.
- Mulch to hold moisture and keep weeds down.
Zone 9 pepper tips
- Plant once the soil reaches 70 °F and nights are around 50 °F or warmer.
- Mulch to keep roots cool. Compost, straw or wood chips suppress weeds and save water. Keep mulch off the stems.
- Expect a summer pause. Peppers drop flowers during very hot days and nights, then start setting fruit again as temperatures ease in late summer.
- Test your soil. Peppers grow best at a pH of 6.0–6.5. Test two to three months before planting so lime has time to work.
Harvesting peppers
Pick peppers as soon as they reach full size and their walls feel firm. Green bells left on the plant turn red, yellow or orange and get sweeter, but that takes extra weeks. Cut the stems with shears instead of pulling, so you don’t break branches, and wear gloves when handling hot peppers. Peppers keep a week or more in the refrigerator.
Pepper planting dates in nearby zones
- Zone 8April 14 – April 21
See dates for every zone on the peppers planting guide, or build a full schedule with the planting calendar.
Frequently asked questions
Is it too late to plant peppers in zone 9 in April?
Not necessarily. Your season is long, so transplants set out in April can produce through fall. Keep them well watered through the summer heat.
Why are my pepper flowers falling off?
Usually because of heat. Peppers drop flowers during very hot days and nights, and start setting fruit again when the weather cools.
When should I start pepper seeds indoors?
About eight to ten weeks before you plan to transplant. Peppers grow slowly at first, so they need more time indoors than tomatoes.
Can I plant peppers before the last frost?
No. Peppers are killed by frost and stall in cold soil. Wait until two to three weeks after your last frost, when nights stay above 50 °F.
Do I have to wait for peppers to turn red?
No. Most peppers can be picked green once they reach full size. Leaving them on the plant makes them sweeter and more colorful.
Sources. Planting dates use the median frost dates of each USDA zone, calculated from NOAA climate data for every ZIP code in the zone.