Honolulu, HI Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Honolulu, Hawaii.
Gardening in Honolulu
Gardening in Honolulu isn't really gardening — it's participating in a tropical ecosystem that's been producing food for a thousand years. The challenge isn't getting things to grow; it's choosing from the overwhelming abundance of possibilities and managing the pests that thrive in paradise as enthusiastically as the plants do.
Zone 10b with no frost — ever. Your growing season is 364 days (the missing day is just for rest). Tropical humidity, trade winds, and volcanic soil create conditions where food literally grows itself. The flip side: pest and disease pressure is year-round and intense. Every bug in the Pacific knows your garden exists. The elevation variation from sea level to the Ko'olau Range means 100 different microclimates within 20 miles.
Hawaiian agriculture predates European contact by a millennium — the ahupua'a system of land management was sustainable agriculture before the term existed. Today, the local food movement in Honolulu is about reconnecting with that heritage. Growing your own taro, breadfruit, and sweet potato isn't trendy — it's traditional. The Kapiolani Community College farmers market is where ancient and modern Hawaiian food culture intersect every Saturday.
What This Means for Honolulu Gardeners
The average last spring frost in Honolulu is around January 1, and the average first fall frost arrives around December 31. That gives you approximately 364 frost-free days to work with.
Honolulu's growing season is essentially year-round. Frost is a rare event, not a seasonal boundary. Traditional cool-season crops grow through your mild winter, while tropical and subtropical plants thrive permanently outdoors. Your challenge isn't length of season — it's managing summer heat and humidity. Plant warm-season vegetables from September through February and shift to heat-tolerant crops for the summer months.
These dates are based on NOAA 30-year Climate Normal data for the Honolulu area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in Honolulu
With 364 frost-free days, Honolulu can grow nearly anything — including tropical and subtropical plants that most of the country can only dream about. Your prime vegetable season runs from fall through spring; summer is for heat-lovers like okra, sweet potatoes, and peppers. Recommended starting points: cherry tomatoes, jalapeños, okra, sweet potatoes, basil, collard greens, tomatillos, and lemongrass.
See the full Hawaii planting guide for all 40 plants: Hawaii Planting Calendar. Or enter your zip code for exact planting dates personalized to Honolulu.
More About Zone 10B
Honolulu is in USDA Hardiness Zone 10B, which means average annual extreme minimum temperatures between 35°F to 40°F. View the full Zone 10B planting guide.
See the complete planting calendar for Hawaii: Hawaii Planting Calendar.
Other Cities in Hawaii
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Honolulu area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within Honolulu (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
You can plant cool-season crops (lettuce, kale, broccoli) from December 31 through January 1 — your cool season is your primary vegetable season. Warm-season crops like tomatoes and peppers go out in early spring. Tropical plants grow year-round. Enter your zip code for exact dates for every plant.