Fort Defiance, AZ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fort Defiance, a community in Mckinley County, Arizona.
This Afternoon
74°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly sunny. High near 74, with temperatures falling to around 72 in the afternoon. Southwest wind around 14 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
7-day forecast for Fort Defiance
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Chance Showers And Thunderstorms | 14 mph SW | 37% |
| Tonight | 48°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 8 mph S | 20% |
| Saturday | 76°F | Sunny | 1 to 16 mph SW | 7% |
| Saturday Night | 41°F | Mostly Clear | 1 to 8 mph NW | 1% |
| Sunday | 76°F | Sunny | 2 to 10 mph W | 0% |
| Sunday Night | 44°F | Mostly Cloudy | 1 to 7 mph NW | 0% |
| Monday | 75°F | Partly Sunny | 1 to 10 mph SW | 1% |
| Monday Night | 49°F | Partly Cloudy then Chance Rain Showers | 0 to 3 mph N | 28% |
| Tuesday | 73°F | Showers And Thunderstorms Likely | 0 to 10 mph S | 71% |
| Tuesday Night | 46°F | Showers And Thunderstorms Likely | 0 to 5 mph SE | 61% |
| Wednesday | 70°F | Showers And Thunderstorms Likely | 0 to 5 mph E | 56% |
| Wednesday Night | 46°F | Chance Showers And Thunderstorms | 0 to 3 mph E | 33% |
| Thursday | 70°F | Chance Showers And Thunderstorms | 0 to 6 mph E | 50% |
| Thursday Night | 47°F | Chance Showers And Thunderstorms | 1 to 5 mph SE | 43% |
Forecast source: National Weather Service (api.weather.gov) for Fort Defiance (35.748, -109.068). Updated through the day.
Growing snapshot for Fort Defiance
Last spring frost
May 29
First fall frost
Sep 28
Growing season
121 days
Hardiness zone
6b
More local growing data for Fort Defiance: nearby ZIP 86515 weather · frost dates · planting calendar · Arizona frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Window Rock Ap, Az (5.5 mi from Fort Defiance). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.