Peas are a cool-season crop, and in Zone 12 that means a short, precious window: with winter lows of 50 to 60°F, peas only thrive in the coolest months, roughly December through February, and they finish quickly once the heat returns. Grown in that window they are one of the sweetest things a garden can produce, and a sowing made in December gives pods in 60–70 days.
The Zone 12 challenge is heat. These are cool-season crops, and in a frost-free tropical zone the coolest months are short — plant by the coolest part of the year, give afternoon shade, and accept that the season is brief and the harvest smaller than in a cool climate.
Zone 12 at a glance
USDA Zone 12 covers the warmest lowland parts of Hawaii and Puerto Rico. Winters are very mild, with average winter lows of 50 to 60°F, frost is unknown, and the growing season runs all year. Zone 12 has no average last spring frost and no average first autumn frost — it is frost-free year-round — so planting dates here are averages and guidance, not exact dates for any one garden; check your local extension service before planting.
| Detail | Zone 12 guidance |
|---|---|
| Average winter low | 50 to 60°F |
| Average last spring frost | frost-free (no frost dates) |
| Average first autumn frost | frost-free (no frost dates) |
| Days to germination | 7–14 days |
| Days to maturity | 60–70 days |
| Sowing | direct sow |
| Sun | full sun |
| Soil pH | 6.0–7.5 |
| Spacing | 2–3 inches |
| Water needs | moderate |
| Cold tolerance | hardy |
When to plant peas in Zone 12
Plant peas in Zone 12 in the coolest months only, roughly December through February. Seeds germinate in 7–14 days and the crop matures in 60–70 days, so a sowing made in December is ready around February to February. Zone 12 is frost-free, so there are no last or first frost dates — check your local extension service for advice on your own microclimate. Sown outside the cool window, this crop bolts, turns bitter or fails to size up in the heat, so treat the coolest months as the whole season and plan other crops for the hot months.
The planting calendar hub and the December in Zone 12 month guide show what else is happening at planting time.
Starting peas in Zone 12
Sow peas direct where they are to grow — they germinate in 7–14 days and dislike transplanting. Sow in the coolest months, space seed 2–3 inches apart in rows, and put supports in at sowing time: peas climb by tendrils, and a trellis, netting or twiggy sticks gives them something to hold. Soak seed overnight before sowing to speed germination.
See also when to plant peas in Zone 11 for the same crop in a slightly cooler zone.
Soil, spacing, sun and water
Peas need full sun and well-drained soil with a pH of 6.0–7.5, and in Zone 12 a spot with light afternoon shade suits them better than full tropical sun. Dig in well-rotted compost before sowing, space plants 2–3 inches apart, and mulch to keep roots cool — peas hate hot, dry soil. They need full sun and a soil pH of 6.0–7.5. Water needs are moderate: water deeply and regularly at the base, in the morning, so leaves dry before night. The germination time calculator can help you plan the bed before you plant.
Companion planting
Marigolds, basil, onions and lettuce are good companions for peas. Onions and lettuce fill the ground beneath the climbing vines, marigolds edge the bed, and like beans, peas fix nitrogen that benefits the crop that follows them. The companion planting finder can suggest combinations for your whole bed, and our guide to when to plant green beans in Zone 12 shows another crop that shares the same planting windows.
Pests and problems
The common pests and problems to watch for with peas are aphids, bean beetles, slugs, cutworms. Aphids cluster on soft new growth and leaf undersides; wash them off with a strong jet of water and encourage ladybirds. Bean beetles skeletonise leaves; hand-pick beetles and remove badly damaged foliage. Slugs feed at night, leaving ragged holes and slime trails; water in the morning and keep the bed clear of debris. Cutworms chew through young stems at soil level overnight; a cardboard collar around each seedling stops them. Your local extension service can confirm an identification if the damage is severe.
Harvest and storage
Pick peas when the pods are full and the peas inside feel plump through the pod — taste one to check, because peas go starchy fast. Pick every couple of days once pods start coming, and pick in the morning when pods are cool and sweet. Fresh peas are best eaten the same day, because their sugars turn to starch quickly after picking. Shell peas keep for a few days in the fridge, and blanching and freezing is the best way to keep a surplus.
Frequently asked questions
When should I plant peas in Zone 12?
Plant peas in Zone 12 in the coolest months only, roughly December through February. Zone 12 is frost-free year-round, so there are no last or first frost dates — plant by the heat and the wet and dry seasons, and check your local extension service for your own microclimate.
Why did my peas stop producing so quickly?
Heat ends the pea season in Zone 12. Peas flower and set pods in cool weather, and once temperatures climb they stop flowering, yellow and die — that is normal, not a failure. Sow in the coolest months, give afternoon shade, and enjoy a short, sweet harvest.
Can I grow peas in Zone 12 year-round?
No — not well. This is a cool-season crop, and outside the coolest months, roughly December through February, it bolts, turns bitter or fails to size up in tropical heat. Grow it in the cool window, and plant heat-loving crops in the hot months instead.
Can I grow peas in shade in Zone 12?
Light afternoon shade helps peas in Zone 12 — it keeps roots cool and stretches the season by a few weeks. They still need good morning sun to flower and set pods, so avoid deep shade.