When is the last frost in Waipahu, HI?

Frost is extremely rare here at the nearest NOAA station (Ewa Kalaeloa Ap, HI), so there is no reliable average last frost date.

When is the first frost in Waipahu, HI?

Frost is extremely rare here at the nearest NOAA station.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 96797Waipahu, HI

Frost is extremely rare here near Waipahu, based on NOAA 1991-2020 records for the Ewa Kalaeloa Ap, HI station.

Frost is extremely rare here. Frost-tender plants can usually grow year-round, but cover them if a rare cold snap is forecast.

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	—	—	365 days	0%
Frost / freeze (32°F)	—	—	365 days	0%
Hard freeze (28°F)	—	—	365 days	0%

Where these dates come from

ZIP code 96797 is matched to the NOAA station Ewa Kalaeloa Ap, HI, 10.7 km away, at 54 ft elevation (139 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Ewa Kalaeloa Ap, HI (used)	54 ft	—	—
Ewa Beach Usgs 702.2, HI	5 ft	—	—
Upper Wahiawa 874.3, HI	1,006 ft	—	—
Puu Manawahua 725.6, HI	1,673 ft	—	—

Frost dates near Waipahu

Pearl City, HI 96782 · last —, first —
Jbphh, HI 96853 · last —, first —
Tripler Army Medical Center, HI 96859 · last —, first —
Mililani, HI 96789 · last —, first —
Ewa Beach, HI 96706 · last —, first —
Aiea, HI 96701 · last —, first —
Kapolei, HI 96709 · last —, first —
Kunia, HI 96759 · last —, first —

Frequently asked questions

When is the last frost in Waipahu, HI?: Frost is extremely rare here at the nearest NOAA station (Ewa Kalaeloa Ap, HI), so there is no reliable average last frost date.
When is the first frost in Waipahu, HI?: Frost is extremely rare here at the nearest NOAA station.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.