Bell peppers are one of the best crops for a Zone 10 garden: they love heat, they love the long season, and a few plants will give you peppers for months. Unlike tomatoes, which sulk when nights stay hot, peppers keep setting fruit through the warm months — which makes them one of the most reliable summer crops in the warmest zones.
Start with a mix of colours — green, red, yellow and orange — and remember that a pepper left on the plant changes colour as it ripens, getting sweeter as it goes. Green peppers are simply unripe ones, so patience is rewarded with sweetness.
Zone 10 at a glance
USDA Zone 10 covers the warmest parts of the United States, including southern Florida, southern coastal California, Hawaii and Puerto Rico. Winters are very mild, with average winter lows of 30 to 40°F, frost is rare, and the growing season runs nearly all year.
The average last spring frost is Jan 15–30 (frost rare) and the average first autumn frost is Dec 15–31 (frost rare) — USDA/NOAA averages, not exact dates, so check your local extension service before planting.
| Detail | Zone 10 guidance |
|---|---|
| Average winter low | 30 to 40°F |
| Average last spring frost | Jan 15–30 (frost rare) |
| Average first autumn frost | Dec 15–31 (frost rare) |
| Days to germination | 7–14 days |
| Days to maturity | 60–90 days |
| Sowing | start indoors |
| Sun | full sun |
| Soil pH | 6.0–6.8 |
| Spacing | 18–24 inches |
| Water needs | moderate |
| Cold tolerance | tender |
When to plant bell peppers in Zone 10
Plant bell peppers in Zone 10 in two seasons: a spring planting from February through April, and an autumn planting from August through September. Seeds germinate in 7–14 days and fruit matures in 60–90 days, so a February planting is cropping by April or May, and an August planting fruits from October onwards. The average last spring frost in Zone 10 is Jan 15–30, with frost rare, and the average first autumn frost is Dec 15–31, with frost rare — those are USDA zone averages, not exact dates for any one garden, so always check your local extension service for your own frost dates. Peppers are tender and need warm soil, so do not rush the spring planting: wait until nights are reliably mild and the soil has warmed, even though frost is rare. A spring plant that goes in too early will sit and sulk, while one planted a few weeks later will overtake it.
Work back from the frost dates: the planting calendar hub and the March in Zone 10 month guide show what else is happening at planting time.
Starting bell peppers in Zone 10
Start bell peppers indoors from seed, eight to ten weeks before you plan to plant out — sow in December or January for a spring planting, and in June or July for an autumn planting. Pepper seed needs warmth to germinate: keep it at a warm room temperature and be patient, since germination takes 7–14 days and can be slower in cool conditions. Grow seedlings in the strongest light you can give them, potting them on once, and harden them off for a week before they go outside. Transplant out only once nights are reliably mild, spacing plants 18–24 inches apart. Put a stake in at planting time — a pepper loaded with fruit will flop over in wind or heavy rain.
See also when to plant bell peppers in Zone 8 for the same crop in a cooler zone.
Soil, spacing, sun and water
Bell peppers need full sun and rich, well-drained soil with a pH of 6.0–6.8. Dig in well-rotted compost before planting — peppers are hungry plants, and a well-fed plant produces far more fruit. Space plants 18–24 inches apart so air can move between them; crowded plants stay damp and invite disease. Water needs are moderate: keep the soil evenly moist, especially while fruit is setting and swelling, because uneven watering causes blossom-end rot. Mulch thickly to hold moisture and keep roots cool, and water at the base in the morning so leaves dry before night. The plant spacing calculator can help you plan the bed before you plant.
Companion planting
Good companions for bell peppers include basil, onions, tomatoes, marigolds and carrots. Basil and marigolds at the bed edge are said to deter pests, while onions and carrots fill the gaps between young plants. Tomatoes share the same bed well, though both are in the same family, so rotate the bed each year and do not plant peppers where tomatoes, eggplant or potatoes grew last year. Hot peppers are another heat-loving Zone 10 crop with the same timing, and our guide to when to plant hot peppers in Zone 10 shows how the two can be grown side by side. The companion planting finder can suggest combinations for your whole bed.
Pests and problems
The common pests to watch for with bell peppers are aphids, cutworms, flea beetles and whiteflies. Aphids cluster on soft new growth and buds; wash them off with a strong jet of water and encourage ladybirds. Cutworms chew through young stems at soil level overnight; a cardboard collar around each seedling stops them. Flea beetles make small holes in the leaves of young plants; cover seedlings with insect mesh until they are established. Whiteflies flutter up in clouds when disturbed and feed on the undersides of leaves; yellow sticky traps and good air flow help.
Harvest and storage
Bell peppers take 60–90 days to maturity from transplanting, so Zone 10 spring plants set out in February start cropping in April or May, and autumn plants set out in August fruit from October onwards. Pick peppers when they are full-sized and firm — green, or leave them on the plant to ripen to red, yellow or orange for a sweeter flavour. Cut the fruit with scissors or a knife, leaving a short stem, rather than pulling it off and damaging the plant. Pick little and often: regular picking encourages the plant to set more fruit. Store peppers in the fridge and use within a week, or freeze them chopped for cooking.
Frequently asked questions
When should I plant bell peppers in Zone 10?
Plant in two seasons: spring (February–April) and autumn (August–September). Seeds germinate in 7–14 days and fruit matures in 60–90 days. Wait until nights are reliably mild — peppers need warm soil.
Why are my peppers not setting fruit?
Usually too-cold nights early in the season, or very hot, dry conditions later. Peppers set fruit best in warm, settled weather with even watering. Keep the soil moist and be patient — plants often start setting heavily once nights warm up.
How far apart should I space bell peppers in Zone 10?
Space plants 18–24 inches apart, in full sun and soil with a pH of 6.0–6.8. Crowding slows growth and invites disease.