Frost Dates & Planting Calendar for Diamond Head / Kapahulu / Saint Louis Heights, HI
Diamond Head / Kapahulu / Saint Louis Heights, HI rarely if ever sees frost. Here's what that means for planting, plus year-round monthly temperature normals and a 42-crop garden calendar for the area.
Frost-Free Climate
Growing Season
Year-round
No measurable freeze (32°F or below) in the 1991–2020 NOAA normals record.
USDA Hardiness Zone
Zone 12b
Tropical, essentially frost-free conditions year-round.
Data: NOAA station WAIKIKI 717.2, HI US, 0.8 km away.
Monthly Temperatures
Avg. high
Avg. temp
Avg. low
Planting Calendar
| Crop | Planting notes | Days to maturity |
|---|---|---|
| Tomato | This location is frost-free — grow tomato nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 60–85 days |
| Pepper | This location is frost-free — grow pepper nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 60–90 days |
| Eggplant | This location is frost-free — grow eggplant nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 65–85 days |
| Cucumber | This location is frost-free — grow cucumber nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 50–65 days |
| Zucchini | This location is frost-free — grow zucchini nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 45–55 days |
| Winter Squash | This location is frost-free — grow winter squash nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 80–110 days |
| Pumpkin | This location is frost-free — grow pumpkin nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 90–120 days |
| Watermelon | This location is frost-free — grow watermelon nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 70–90 days |
| Cantaloupe | This location is frost-free — grow cantaloupe nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 70–90 days |
| Corn | This location is frost-free — grow corn nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 60–100 days |
| Green Bean | This location is frost-free — grow green bean nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 50–65 days |
| Pea | This location is frost-free — pea can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 55–70 days |
| Lettuce | This location is frost-free — lettuce can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 45–60 days |
| Spinach | This location is frost-free — spinach can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 40–50 days |
| Kale | This location is frost-free — kale can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 50–65 days |
| Arugula | This location is frost-free — arugula can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 30–40 days |
| Swiss Chard | This location is frost-free — swiss chard can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 50–60 days |
| Broccoli | This location is frost-free — broccoli can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 55–80 days |
| Cauliflower | This location is frost-free — cauliflower can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 55–85 days |
| Cabbage | This location is frost-free — cabbage can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 60–100 days |
| Brussels Sprouts | This location is frost-free — brussels sprouts can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 90–110 days |
| Carrot | This location is frost-free — carrot can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 60–80 days |
| Beet | This location is frost-free — beet can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 50–65 days |
| Radish | This location is frost-free — radish can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 22–30 days |
| Turnip | This location is frost-free — turnip can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 40–60 days |
| Onion | This location is frost-free — onion can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 90–120 days |
| Garlic | This location is frost-free — garlic can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 240–270 days |
| Potato | This location is frost-free — potato can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 70–120 days |
| Sweet Potato | This location is frost-free — grow sweet potato nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 90–120 days |
| Asparagus | This location is frost-free — asparagus can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 730–1095 days |
| Crop | Planting notes | Days to maturity |
|---|---|---|
| Basil | This location is frost-free — grow basil nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 50–70 days |
| Cilantro | This location is frost-free — cilantro can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 45–70 days |
| Parsley | This location is frost-free — parsley can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 70–90 days |
| Dill | This location is frost-free — dill can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 40–60 days |
| Oregano | This location is frost-free — oregano can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 80–90 days |
| Thyme | This location is frost-free — thyme can typically be planted in fall/winter/spring; avoid the hottest mid-summer stretch. | 85–95 days |
| Crop | Planting notes | Days to maturity |
|---|---|---|
| Sunflower | This location is frost-free — grow sunflower nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 70–100 days |
| Zinnia | This location is frost-free — grow zinnia nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 60–70 days |
| Marigold | This location is frost-free — grow marigold nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 45–60 days |
| Cosmos | This location is frost-free — grow cosmos nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 60–90 days |
| Nasturtium | This location is frost-free — grow nasturtium nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 50–65 days |
| Dahlia | This location is frost-free — grow dahlia nearly year-round; time planting around the summer heat and rainy/dry season rather than frost. | 90–120 days |
Dates are relative windows based on university extension guidelines, adapted for a frost-free climate — not a guarantee.
Frequently Asked Questions
Does Diamond Head / Kapahulu / Saint Louis Heights, HI get frost?
No. Based on NOAA's 1991–2020 climate normals for the WAIKIKI 717.2, HI US station, Diamond Head / Kapahulu / Saint Louis Heights did not record a measurable freeze (32°F or below), so it's classified as frost-free.
Can I garden year-round in Diamond Head / Kapahulu / Saint Louis Heights, HI?
Yes. Without a hard frost limiting the season, most crops can be planted nearly any time of year in Diamond Head / Kapahulu / Saint Louis Heights. Timing shifts around summer heat and rainy/dry seasons rather than frost risk.
What's the typical temperature range in Diamond Head / Kapahulu / Saint Louis Heights, HI?
Average monthly lows range from about 66°F to 75°F, and average monthly highs range from about 81°F to 88°F, based on 1991–2020 NOAA normals.
What USDA hardiness zone is Diamond Head / Kapahulu / Saint Louis Heights, HI in?
Diamond Head / Kapahulu / Saint Louis Heights, HI is in USDA plant hardiness zone 12b, per the USDA's 2023 Plant Hardiness Zone Map. Tropical, essentially frost-free conditions year-round.