Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 96751 — Kealia, HI

ZIP code 96751 (Kealia, Kauai County) is in USDA zone 12b: the coldest winter night averages 55 to 60 °F.

Where ZIP 96751 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone12b55 to 60 °F

Coldest night12.8 to 15.6 °C

Last frostrare

First frostrare

2012 zone12b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 12b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Kealia, HI…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Kanalohuluhulu 1075, HI — 23 miles away, elevation 3,599 ft) the median growing season is 365 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

Native plants for zone 12b in Hawaii

37 plants native to Hawaii, recorded in Hawaii, and rated by the USDA to survive 55 °F or colder — the bottom of zone 12b. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Kealia, HI.

Soil in Kealia, HI

The soil mapped at the center of ZIP 96751 is Ioleau — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up

pH4.3strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter4.5%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Ioleau silty clay loam, 2 to 6 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 96751; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Kealia, HI

Summer high85 °Faverage high, July

Winter low66 °Faverage low, January

Hot days1days a year at 90 °F or more

Freezing nights0nights a year at 32 °F or less

Growing degree days9,599base 50 °F — the season’s usable heat

Longest day13 h 29 mindaylight on June 21

Shortest day10 h 47 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation73.8 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Lihue WSO Airport 1020.1, HI (9 mi away); precipitation: Kapaa 1.4 W, HI (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

4 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

Princeville, HI · 11 mi

Hawaii planting zones →

Questions about 96751

What planting zone is ZIP code 96751?

ZIP code 96751 (Kealia, HI) is in USDA hardiness zone 12b on the 2023 map: the coldest night of an average winter reaches 55 to 60 °F (12.8 to 15.6 °C).

How much rain and snow does 96751 get?

About 73.8 inches of precipitation a year (NOAA 1991–2020 normals, Kapaa 1.4 W station).

How hot do summers get in Kealia, HI?

The average high peaks at 85 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 96751 have?

The USDA soil survey maps Ioleau at the center of ZIP 96751: silty clay loam, well drained, pH about 4.3 (strongly acidic).

What kind of onions grow in Kealia, HI?

Short-day onions: the longest day near 96751 is 13 h 29 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.