GreenlyLast and first frost dates in Honolulu
United States
Honolulu had no frost in 2016–2025, so crops are planted by warmth and rain rather than by frost dates.
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| Last spring frost | none in ten years |
|---|---|
| First autumn frost | none in ten years |
| Hardiness zone (USDA-equivalent) | official USDA map: 12b |
Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.
There is no frost season here: crops are planted by warmth and rain rather than by frost dates.
What planting zone is Honolulu?
The official USDA map (2023, 1991–2020 data) puts the centre of Honolulu (ZIP 96813) in zone 12b. Zone 12b stands for an average coldest night of 55 to 60 °F (12.8 to 15.6 °C), so perennials hardy to zone 12b or a colder zone should come through a typical winter here.
Check the official USDA map for Honolulu: USDA Plant Hardiness Zone Map.
When the soil warms up in Honolulu
The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo).
| Soil | Date |
|---|---|
| 5 °C | already in the first week of January |
| 10 °C | already in the first week of January |
| 15 °C | already in the first week of January |
| 18 °C | already in the first week of January |
Frost dates near Honolulu
Of the nearest cities on our list, the last spring frost ends earliest in Stockton (4 February) and latest in San Jose (24 February).
| City | Distance | Last spring frost | First autumn frost |
|---|---|---|---|
| Hilo | 339 km | — | — |
| San Francisco | 3,854 km | — | — |
| San Jose | 3,884 km | 24 February | — |
| Stockton | 3,955 km | 4 February | 3 December |
| Sacramento | 3,959 km | 18 February | 11 December |
Seeds, seedlings and markets in Honolulu
Within 15 km of Honolulu OpenStreetMap lists 6 garden centres, 1 plant nursery, 9 markets and 2 farm shops (collected 20 October 2026). The nearest garden centre to the city centre is Koolau Farmers, 3 km away.
- Koolau Farmers — garden centre
South Beretania Street 1935, 96826 Honolulu · Mon–Sun 08:00–17:00 · 3 km · koolaufarmers.com - Maunakea Marketplace — market
Maunakea Street 1120, 96817 Honolulu · 0 km - Frankie's Nursery — farm shop
Mahiku Place 41-999, 96795 Waimanalo · Tue–Sat 09:00–15:00 · 13 km · frankiesnurseryllc.com - Geobunga — garden centre
Iwaena Street 99-969, 96701 Aiea · Mon–Fri 08:00–16:00; Sat 09:00–16:00 · 9 km · geobunga.com - Aloha Tower Marketplace — market
Aloha Tower Drive 1, 96813 Honolulu · 1 km · alohatower.com - Koolau Farmers — garden centre
Kailua Road 1127, 96734 Kailua · 14 km
Places: © OpenStreetMap contributors, ODbL.
Honolulu: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in Honolulu by month
Average weather in Honolulu over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: January–December (25.1–28.6 °C). No month averages below 0 °C at night; the coldest nights, in February, average 20.8 °C. About 785 mm of rain falls in a year, on 202 days; December is the wettest month (84 mm) and January the driest (53 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 25.6 | 21.1 | 53 | 11 |
| February | 25.1 | 20.8 | 63 | 13 |
| March | 25.5 | 21.2 | 70 | 17 |
| April | 26.1 | 22 | 78 | 19 |
| May | 26.7 | 22.7 | 69 | 20 |
| June | 27.5 | 23.6 | 65 | 18 |
| July | 28 | 24.2 | 65 | 20 |
| August | 28.6 | 24.6 | 67 | 19 |
| September | 28.6 | 24.4 | 56 | 18 |
| October | 28.2 | 24 | 62 | 17 |
| November | 27 | 23.3 | 53 | 15 |
| December | 25.9 | 22 | 84 | 15 |
Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).
