When to Plant Peppers in New Hampshire
Published: April 21, 2026
New Hampshire gardeners in Zone 5b have a 28-week frost-free window for pepper (April 7 to October 22). Warm-season crops like pepper must be started indoors early to maximize the short window — New Hampshire's late spring and early fall frost dates leave little room for error. This guide gives exact dates for New Hampshire based on your local frost calendar.
Pepper Planting Dates for New Hampshire
| Start seeds indoors | February 10–17 |
| Last frost (average) | April 7 |
| Transplant outdoors | April 21–May 1 |
| Expect first harvest | June 20 – July 20 |
| First fall frost (average) | October 22 |
Dates above assume Zone 5b, the most common zone in New Hampshire. Gardeners in cooler Nashua (Zone 5b) plant 1–2 weeks later; warmer Portsmouth (Zone 5a) can plant 1–2 weeks earlier.
Growing Peppers in New Hampshire's Climate
New Hampshire's cold Zone 5b climate puts warm-season pepper at the edge of viability — but the edge is workable with good planning. Starting seeds indoors under lights in late winter is the most important step; skipping this puts the whole harvest at risk from the short outdoor growing window.
Season extenders pay for themselves many times over in New Hampshire. Row covers placed over transplants in early spring add 5°F to 8°F of protection and can extend the season two to three weeks on each end. Black plastic mulch warms the soil to the temperatures pepper needs for aggressive root growth.
Common pepper pests to watch for in New Hampshire include Aphids and Pepper Weevil. The first line of defense is companion planting: Basil and Tomato planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Pepper Garden Calendar for New Hampshire
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| March | — | Dormant season |
| April | Transplant outdoors | Soil temp must be 65°F+; nighttime lows above 50°F |
| May ← | — | Dormant season |
| June | Peak growth; water 1 inch/week | Monitor for pests daily; stake or support as needed |
| July | Continue care | Consistent watering; remove yellow leaves |
| August | — | Dormant season |
| September | — | Dormant season |
| October | First frost approaches | Harvest remaining pepper; cover plants on frost nights |
| November | — | Dormant season |
| December | — | Dormant season |
Pepper Growing Tips for New Hampshire Gardeners
- •Start indoors 8 full weeks before last frost — peppers are the slowest vegetable to establish from seed.
- •Nighttime temps must stay consistently above 55°F before transplanting — cold nights halt growth.
- •New Hampshire's short growing season means start seeds indoors under grow lights — don't rely on windowsill light which produces leggy, weak seedlings that struggle outdoors.
- •Cover young transplants with floating row covers for the first 2–3 weeks outside. The 3–5°F of protection reduces frost damage risk and accelerates early growth.
- •Use a bloom fertilizer (low nitrogen, higher phosphorus) once flowering begins for best fruit set.
Companion Planting for Peppers in New Hampshire
In New Hampshire's cold climate, planting pepper with Basil and Tomato helps deter pests and improve soil. Avoid planting near Fennel and Brassicas, which inhibit pepper growth through root chemistry or shared pest pressure. See the full pepper companion planting guide for the complete list.
Peppers Planting Dates by City in New Hampshire
Top cities in New Hampshire — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant pepper in New Hampshire?
In New Hampshire (Zone 5b), start pepper seeds indoors around February 10–17 and transplant outdoors around April 21–May 1 — 2 weeks after the state's average last frost of April 7.
What is the last frost date in New Hampshire?
New Hampshire's average last frost date is April 7 in the state's most common Zone 5b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow pepper year-round in New Hampshire?
Not year-round — New Hampshire's cold season stops pepper production. The pepper season runs April 7 to October 22, roughly 28 weeks.
What pepper varieties grow best in New Hampshire?
For New Hampshire's Zone 5b, Early varieties like Ace and King Arthur mature in 65–70 days — important when summers are short.
When do I start pepper seeds indoors in New Hampshire?
Start pepper seeds indoors in New Hampshire around February 10–17, which is 8 weeks before the state's average last frost of April 7. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.