Urban Honolulu, Hawaii planting calendar and frost dates

Frost dates in Urban Honolulu

A 32°F night is not recorded here: it happens in fewer than 1 year in 100, so median frost dates do not describe a typical year.

NOAA U.S. Climate Normals 1991-2020 for Honolulu International Airport, 4.7 miles WNW of the city center. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers.

What to plant each month in Urban Honolulu

Low-elevation Hawaii has a slightly cooler, wetter winter (roughly October-April) and a warmer, drier summer, but temperatures allow gardening all year. Cool-loving crops such as cabbage, broccoli, lettuce, carrots and tomatoes do best when sown from about September to April, because summer heat at sea level causes bolting, poor heads and poor fruit set. Beans, sweet potatoes, eggplant, chard and green onions can be planted in any month, and okra prefers the warm months. Heavy winter rains on windward coasts and trade winds also affect crops. The months below follow the planting calendar for Hawaii (low elevation) from the Cooperative Extension sources listed.

1. January

   Plant: beets, broccoli, cabbages, carrots, eggplants, green beans, green onions, lettuce, parsley, peppers, potatoes, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

2. February

   Plant: beets, broccoli, cabbages, carrots, eggplants, green beans, green onions, lettuce, parsley, peppers, potatoes, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

3. March

   Plant: beets, broccoli, carrots, eggplants, green beans, green onions, lettuce, okra, parsley, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

4. April

   Plant: beets, broccoli, carrots, eggplants, green beans, green onions, lettuce, okra, parsley, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

5. May

   Plant: eggplants, green beans, green onions, okra, parsley, radishes, sweet potatoes, swiss chard

6. June

   Plant: eggplants, green beans, green onions, okra, parsley, radishes, sweet potatoes, swiss chard

7. July

   Plant: eggplants, green beans, green onions, okra, parsley, radishes, sweet potatoes, swiss chard

8. August

   Plant: eggplants, green beans, green onions, okra, parsley, radishes, sweet potatoes, swiss chard

9. September

   Plant: beets, broccoli, cabbages, carrots, celery, eggplants, green beans, green onions, lettuce, okra, parsley, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

10. October

    Plant: beets, broccoli, cabbages, carrots, celery, eggplants, green beans, green onions, lettuce, okra, parsley, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

11. November

    Plant: beets, broccoli, cabbages, carrots, celery, eggplants, green beans, green onions, lettuce, parsley, peas, peppers, potatoes, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

12. December

    Plant: beets, broccoli, cabbages, carrots, celery, eggplants, green beans, green onions, lettuce, parsley, peas, peppers, potatoes, radishes, sweet corn, sweet potatoes, swiss chard, tomatoes, turnips

Frost dates and zones by ZIP code in Urban Honolulu

All 7 of Urban Honolulu's main ZIP codes take their frost dates from Honolulu International Airport, so the dates on this page apply across the city. Every one of them is in zone 12b.

Nearby cities

• San Francisco, CA zone 10b
• Daly City, CA zone 10a
• Santa Cruz, CA zone 9b, last frost Mar 25
• South San Francisco, CA zone 10a
• San Mateo, CA zone 10a
• San Rafael, CA zone 10a, last frost Jan 16