Hawaii vegetable planting calendar 2027: frost dates and when to plant
The nearest weather station to Honolulu rarely records a frost. Below are planting dates for Honolulu for 27 common vegetables and herbs, worked out the way the Rowtime app does it: NOAA's average frost dates for the nearest weather station, with the planting rules of state extension guides. Dates are for the 2027 season.
Rowtime: Garden Planner works these dates out for your own ZIP code in Hawaii, shows where each one comes from, and recalculates when a planting slips. Get Rowtime on the App Store.
Dates are estimates. Check your local extension office before you plant, and use your own frost records if you have them. Dates shift by a week or more within a state, so pick the city closest to your conditions.
Honolulu
When to plant tomatoes in Honolulu?
In Honolulu, Hawaii, the nearest NOAA weather station rarely records a frost (NOAA 1991-2020 normals, WAIKIKI 717.2 station, 5.8 km from ZIP 96813). Planting dates here follow the planting table for Hawaii below 1,000 ft from University of Hawaii, Hawaii Agricultural Experiment Station (CTAHR), not frost dates. For tomatoes, plant outdoors September 1 to April 30. Dates are for the 2027 season; sources last checked October 21, 2026.
Frost dates for Honolulu (96813)
- The nearest NOAA station rarely records a frost, so no frost dates are listed.
- USDA hardiness zone 12b (PRISM 2023 listing).
| Crop | When |
|---|---|
| Beet | Sow outdoors: Sep 1 to Apr 30 |
| Broccoli | Plant outdoors: Sep 1 to Apr 30 |
| Cabbage | Plant outdoors: Sep 1 to Feb 28 |
| Carrot | Sow outdoors: Sep 1 to Apr 30 |
| Cauliflower | The planting table for Hawaii below 1,000 ft has no dates for cauliflower. |
| Cucumber | Plant outdoors: Jan 1 to Dec 31 |
| Eggplant | Plant outdoors: Jan 1 to Dec 31 |
| Green onion | Plant outdoors: Jan 1 to Dec 31 |
| Kale | The planting table for Hawaii below 1,000 ft has no dates for kale. |
| Lettuce | Plant outdoors: Sep 1 to Apr 30 |
| Melon and watermelon | The planting table for Hawaii below 1,000 ft has no dates for melon and watermelon. |
| Okra | Plant outdoors: Mar 1 to Oct 31 |
| Onion | Sow outdoors: Sep 1 to Mar 31 |
| Pea | Sow outdoors: Nov 1 to Dec 31 |
| Pepper | Plant out seedlings: Nov 1 to Feb 28 |
| Potato | Plant seed potatoes: Nov 1 to Feb 28 |
| Snap bean | Sow outdoors: Jan 1 to Dec 31 |
| Spinach | The planting table for Hawaii below 1,000 ft has no dates for spinach. |
| Summer squash | Sow outdoors: May 1 to Aug 31 |
| Sweet corn | Sow outdoors: Sep 1 to Apr 30 |
| Sweet potato | Plant out slips: Jan 1 to Dec 31 |
| Tomato | Plant outdoors: Sep 1 to Apr 30 |
| Winter squash and pumpkin | The planting table for Hawaii below 1,000 ft has no dates for winter squash and pumpkin. |
| Basil | The planting table for Hawaii below 1,000 ft has no dates for basil. |
| Cilantro | The planting table for Hawaii below 1,000 ft has no dates for cilantro. |
| Dill | The planting table for Hawaii below 1,000 ft has no dates for dill. |
| Parsley | Plant outdoors: Jan 1 to Dec 31 |
Sources
Planting rules, in the order Rowtime tries them here:
- University of Hawaii, Hawaii Agricultural Experiment Station (CTAHR), Home Gardening in Hawaii (Table 1. Best months for planting seeds of various vegetable crops at different elevations) (Bulletin 91). Checked October 21, 2026.
- University of Hawaii CTAHR Cooperative Extension Service, Summer Squash (Home Garden Vegetable fact sheet) (HGV-15). Checked October 21, 2026.
- University of Hawaii CTAHR Cooperative Extension Service, Onions: Bulb and Green Bunching (Home Garden Vegetable fact sheet) (HGV-16). Checked October 21, 2026.
- University of Hawaii CTAHR Cooperative Extension Service, Cucumber (Home Garden Vegetable fact sheet) (HGV-17). Checked October 21, 2026.
- University of Hawaii CTAHR Cooperative Extension Service, Bell Pepper (Home Garden Vegetable fact sheet) (HGV-3). Checked October 21, 2026.
Frost dates, locations and zones:
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020 annual/seasonal (freeze probabilities).
- U.S. Census Bureau, 2025 Gazetteer Files: ZIP Code Tabulation Areas.
- PRISM Group, Oregon State University / USDA ARS, 2023 USDA Plant Hardiness Zone Map ZIP code listings. PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed 20 Oct 2026.
How the dates are worked out: a guide's rule such as "two weeks after the last frost" is applied to the station's NOAA date. Purdue's dates are 10% dates, so they are counted from the station's 10% date. When a guide gives no last date, the window closes early enough for the crop's longest days to harvest before the first fall frost. When a guide gives no first date for a fall planting, no fall window is shown. "Season too short" means the guide's window would close before it opens at this station's frost dates.
Other states
All states Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming