Frost dates for Mauna Loa 5 NNE, HI
At Mauna Loa 5 NNE, the median last spring frost (32°F) is Apr 12 and the median first fall frost is Dec 1, for a typical growing season of 235 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zones 11a to 12b.
- Apr 12Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Dec 1First fall frost (median)50% chance of 32°F by this date
- 235 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 32°F | Mar 13 | Apr 12 | May 18 |
| 28°F | Jan 15 | Feb 13 | Mar 13 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 32°F | Nov 9 | Dec 1 | Jan 7 |
| 28°F | Dec 17 | Jan 22 | Feb 23 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 56 days | 91 days | 153 days |
| 32°F | 187 days | 235 days | 276 days |
| 28°F | 293 days | 327 days | 365 days |
| 24°F | 352 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 72% |
| 24°F | 10% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 96726 | 11a | 40 to 45°F | 28 km |
| 96750 | 12b | 55 to 60°F | 33 km |
| 96725 | 11a | 40 to 45°F | 35 km |
| 96777 | 12b | 55 to 60°F | 36 km |
| 96785 | 11a | 40 to 45°F | 37 km |
| 96704 | 12b | 55 to 60°F | 39 km |
| 96720 | 11a | 40 to 45°F | 39 km |
| 96771 | 11b | 45 to 50°F | 41 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USW00021514, at 19.5353, -155.5761, elevation 3407 m (11,179 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 34.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hawaii Vol National Park HQ 54 (36 km)
- Opihihale #2 24.1 (43 km)
- Sea Mountain 12.15 (45 km)
- Glenwood #2 55.4 (46 km)
- Hilo 5 S (53 km)
- S Kona 2 2.32 (54 km)
- Kailua Kona Ke-Ahole Airport (54 km)
- Ke-Ahole Point 68.13 (55 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.