Frost dates in Honolulu, Hawaii
Frost is rare
At Manoa Lyon Arbo 785.2, NOAA puts the chance of any 32°F night in a year at 0%.
Source: NOAA U.S. Climate Normals 1991–2020, station Manoa Lyon Arbo 785.2 (USC00516128), 3 miles from Honolulu, elevation 500 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
Planting calendar for Honolulu
USDA's planting table covers places whose average last freeze is between January 30 and June 10, and whose first freeze is between August 30 and December 20. Honolulu's frost dates fall outside it (frost is rare here), so we don't give planting dates for it.
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.