Frost dates for Phoenix Deer Valley Municipal Airport, Arizona
Half of years have their last spring frost by January 8, but 1 year in 10 still frosts after February 12.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- February 12
- 1 year in 5
- February 1
- 3 years in 10
- January 23
- 2 years in 5
- January 14
- Half of years (the median)
- January 8
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- December 5
- 1 year in 5
- December 11
- 3 years in 10
- December 15
- 2 years in 5
- December 20
- Half of years (the median)
- December 25
- Growing season
- about 354 days
- Hardiness zones nearby
- 10a, 9b
- Summer days
- a usual high of about 39 °C103 °F
- Lettuce and spinach run to seed
- April to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
- Hot-weather watering
- June to September: days run above 32 °C90 °F and nights stay above 21 °C70 °F, so expect to water daily or every other day (how we know)
- Nearly every drop is yours
- March to December: rain brings less than a quarter of the water a growing garden needs, about 25 mm1 in a week (how we know)
Month by month
- January
- high ~19 °C65 °F · low ~7 °C44 °F · rain ~30 mm1.2 in
- February
- high ~20 °C68 °F · low ~8 °C46 °F · rain ~31 mm1.2 in
- March
- high ~24 °C75 °F · low ~10 °C51 °F · rain ~28 mm1.1 in
- April
- high ~28 °C83 °F · low ~14 °C57 °F · rain ~8.9 mm0.4 in
- May
- high ~33 °C92 °F · low ~18 °C65 °F · rain ~4.8 mm0.2 in
- June
- high ~39 °C101 °F · low ~23 °C73 °F · rain ~0.8 mm0.03 in
- July
- high ~40 °C104 °F · low ~27 °C81 °F · rain ~21 mm0.8 in
- August
- high ~39 °C103 °F · low ~27 °C80 °F · rain ~24 mm1 in
- September
- high ~36 °C98 °F · low ~24 °C75 °F · rain ~18 mm0.7 in
- October
- high ~30 °C86 °F · low ~17 °C63 °F · rain ~17 mm0.7 in
- November
- high ~23 °C74 °F · low ~10 °C51 °F · rain ~23 mm0.9 in
- December
- high ~18 °C64 °F · low ~6 °C43 °F · rain ~21 mm0.8 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Phoenix Deer Valley Municipal Airport station (listed by NOAA as Phoenix Deer Valley Muni Ap, USW00003184), at 33.69, -112.08. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
85020, 85021, 85022, 85023, 85024, 85027, 85029, 85050, 85051, 85053, 85083, 85085…
+4 moreShow fewer
85086, 85308, 85310, 85383.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Laveen 3 SSE, AZ, last frost by January 14
- Chandler Heights, AZ, last frost by February 1
Other stations in Arizona.
- Yuma Mcas, AZ, frost is rare
When do I plant? · Where the dates come from
More ways Milpa can help
When do I plant? · What grows well together? · Plan my garden · What can I plant now? · Something wrong in the garden? · Keep a garden diary · Heard a tip?