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

Planting zone for 96823 — Honolulu, HI

ZIP code 96823 (Honolulu, Honolulu County) is in USDA zone 12b: the coldest winter night averages 55 to 60 °F.

Where ZIP 96823 is

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 Honolulu, 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

Frost is rare or absent here: Honolulu, HI is in zone 12b, where the coldest night of a typical winter stays above freezing. Cool-season vegetables grow best from fall through spring; summer heat, not frost, is the limit.

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.

Trees 7

Chamisso's manfern10 ft · blooms indeterminate · medium shade tolerance · to 40 °Fhapu'u8 ft · blooms indeterminate · medium shade tolerance · to 40 °FHawai'i pritchardia60 ft · medium shade tolerance · to 40 °FKamalo pritchardia16 ft · medium shade tolerance · to 40 °Fkoa110 ft · blooms spring · high shade tolerance · to 31 °Fkoaoha40 ft · blooms early spring · high shade tolerance · to 25 °F

Shrubs 12

'ala'a40 ft · medium shade tolerance · to 40 °F'ohi'a lehua65 ft · blooms late spring · high shade tolerance · to 22 °Fbeach naupaka10 ft · blooms indeterminate · medium shade tolerance · to 31 °FGaudichaud's senna2 ft · to 40 °FHawai'i desert-thorn1 ft · blooms summer · medium shade tolerance · to 40 °FHawai'i hawthorn12 ft · blooms spring · medium shade tolerance · to 35 °F

Wildflowers & perennials 8

bayhops1 ft · blooms indeterminate · medium shade tolerance · to 17 °Fbeach strawberry0.8 ft · blooms early spring · medium shade tolerance · to −33 °Fcommon duckmeatblooms late summer · medium shade tolerance · to −38 °Fcommon maidenhair1.7 ft · blooms summer · low shade tolerance · to −33 °Flongleaf pondweedblooms mid summer · high shade tolerance · to −38 °Fsalt heliotrope1.2 ft · blooms mid spring · high shade tolerance · to −28 °F

Grasses 10

blunt spikerush1.6 ft · blooms summer · high shade tolerance · to 37 °Fcosmopolitan bulrush3 ft · blooms late summer · high shade tolerance · to −23 °Ffragrant flatsedge2 ft · blooms late summer · high shade tolerance · to 42 °Fkawelu3 ft · high shade tolerance · to 40 °Fmanyspike flatsedge1.6 ft · blooms mid summer · high shade tolerance · to 47 °Fovate spikerush1.5 ft · blooms late summer · high shade tolerance · to 47 °F

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 Honolulu, HI.

Soil in Honolulu, HI

The soil mapped at the center of ZIP 96823 is Tantalus — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH6.7neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter12%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Tantalus silty clay loam, 8 to 15 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 96823; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Honolulu, HI

Summer high88 °Faverage high, August
Winter low66 °Faverage low, January
Hot days17days a year at 90 °F or more
Freezing nights0nights a year at 32 °F or less
Growing degree days10,097base 50 °F — the season’s usable heat
Longest day13 h 26 mindaylight on June 21
Shortest day10 h 50 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation31.2 inper year, rain and melted snow

Average high and low, by month

60°70°80°90°100°January: average high 81 °F, low 66 °F 81°66° JanFebruary: average high 81 °F, low 66 °F 81°66° FebMarch: average high 81 °F, low 68 °F 81°68° MarApril: average high 83 °F, low 70 °F 83°70° AprMay: average high 85 °F, low 71 °F 85°71° MayJune: average high 87 °F, low 73 °F 87°73° JunJuly: average high 87 °F, low 75 °F 87°75° JulAugust: average high 88 °F, low 75 °F 88°75° AugSeptember: average high 88 °F, low 74 °F 88°74° SepOctober: average high 87 °F, low 73 °F 87°73° OctNovember: average high 84 °F, low 72 °F 84°72° NovDecember: average high 82 °F, low 69 °F 82°69° Dec

Precipitation by month inches

0″1″2″3″4″January: 2.98 in precipitation 3.0 JanFebruary: 2.79 in precipitation 2.8 FebMarch: 3.97 in precipitation 4.0 MarApril: 2.35 in precipitation 2.4 AprMay: 1.70 in precipitation 1.7 MayJune: 1.55 in precipitation 1.6 JunJuly: 1.69 in precipitation 1.7 JulAugust: 1.72 in precipitation 1.7 AugSeptember: 2.16 in precipitation 2.2 SepOctober: 2.83 in precipitation 2.8 OctNovember: 3.69 in precipitation 3.7 NovDecember: 3.80 in precipitation 3.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Waikiki 717.2, HI (3 mi away); precipitation: Punchbowl Crater 709, HI (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 12b.

9684712b
Honolulu, HI · <1 mi
9684312b
Honolulu, HI · <1 mi
9681312b
Honolulu, HI · <1 mi
9680512b
Honolulu, HI · <1 mi
9680612b
Honolulu, HI · <1 mi
9680712b
Honolulu, HI · <1 mi
9680812b
Honolulu, HI · <1 mi
9680912b
Honolulu, HI · <1 mi

All 40 ZIP codes in Honolulu → · Hawaii planting zones →

Questions about 96823

What planting zone is ZIP code 96823?

ZIP code 96823 (Honolulu, 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 96823 get?

About 31.2 inches of precipitation a year (NOAA 1991–2020 normals, Punchbowl Crater 709 station).

How hot do summers get in Honolulu, HI?

The average high peaks at 88 °F in August, with about 17 days a year at 90 °F or more.

What kind of soil does 96823 have?

The USDA soil survey maps Tantalus at the center of ZIP 96823: silty clay loam, well drained, pH about 6.7 (neutral).

What kind of onions grow in Honolulu, HI?

Short-day onions: the longest day near 96823 is 13 h 26 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.