When is the last frost in Bullhead City, AZ?

For ZIP code 86439, the average last spring frost (32°F) is January 4, based on NOAA 1991-2020 climate normals for the Bullhead City, AZ weather station. There is a 1-in-10 chance of a frost after February 5.

When is the first frost in Bullhead City, AZ?

The average first fall frost (32°F) is December 23. There is a 1-in-10 chance of frost by December 1, so tender plants are at risk from that point on.

How long is the growing season in 86439?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 356 days long.

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 86439Bullhead City, AZ

The average last spring frost in Bullhead City is January 4 and the average first fall frost is December 23, giving a typical growing season of about 356 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 4
Average first fall frost: Dec 23
Growing season: 356 days

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)	Dec 31 · Feb 1 · Feb 28	Nov 24 · Dec 11 · Jan 2	317 days	97%
Frost / freeze (32°F)	Dec 12 · Jan 4 · Feb 5	Dec 1 · Dec 23 · Jan 23	356 days	67%
Hard freeze (28°F)	Dec 7 · Dec 26 · Jan 10	Dec 7 · Dec 25 · Jan 8	365 days	18%

Where these dates come from

ZIP code 86439 is matched to the NOAA station Bullhead City, AZ, 0.7 km away, at 531 ft elevation (20 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Bullhead City, AZ (used)	531 ft	Jan 4	Dec 23
Laughlin, NV	605 ft	Jan 5	Dec 24
Needles Ap, CA	890 ft	Jan 6	Jan 2
Searchlight, NV	3,540 ft	Mar 7	Nov 29

Frost dates near Bullhead City

Bullhead City, AZ 86430 · last Jan 5, first Dec 24
Laughlin, NV 89029 · last Jan 5, first Dec 24
Fort Mohave, AZ 86426 · last Jan 5, first Dec 24
Oatman, AZ 86433 · last Feb 18, first Dec 2
Mohave Valley, AZ 86440 · last Jan 4, first Dec 23
Cal Nev Ari, NV 89039 · last Mar 7, first Nov 29
Golden Valley, AZ 86413 · last Apr 2, first Nov 11
Temple Bar Marina, AZ 86443 · last Apr 2, first Nov 11

Frequently asked questions

When is the last frost in Bullhead City, AZ?: For ZIP code 86439, the average last spring frost (32°F) is January 4, based on NOAA 1991-2020 climate normals for the Bullhead City, AZ weather station. There is a 1-in-10 chance of a frost after February 5.
When is the first frost in Bullhead City, AZ?: The average first fall frost (32°F) is December 23. There is a 1-in-10 chance of frost by December 1, so tender plants are at risk from that point on.
How long is the growing season in 86439?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 356 days long.
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.