FleaDates › Tick season › Arizona
Mountain West · AZ
When are ticks active in Arizona?
Arizona ticks don't take a real winter break: average temperatures stay above the ~40°F questing threshold in every month, with pressure heaviest Mar–Nov.
Ticks to know in Arizona
Arizona's tick picture is unusual: the brown dog tick can finish its entire life cycle inside a house, kennel or garage, and in parts of the state it transmits Rocky Mountain spotted fever, so an indoor infestation here is treated as a health matter and not just a nuisance. Rocky Mountain wood ticks belong to the higher country around Flagstaff, appearing with spring warmth, and statewide pressure stays strong from March into November. Make the after-walk check a habit — ears, toes, groin, collar line — even when the outing was only around the neighborhood.
Wherever the calendar sits this month, the habit that actually catches ticks is the after-walk check: ears, collar line, armpits, between the toes. Prevention plus checks beats either alone.
Month-by-month tick activity in Arizona
| Month | Typical activity | Average temperature |
|---|---|---|
| January | Moderate | 47°F |
| February | Moderate | 49.6°F |
| March | High | 55.4°F |
| April | High | 61.7°F |
| May | Peak | 70°F |
| June | Peak | 79.4°F |
| July | Peak | 83.5°F |
| August | Peak | 82.1°F |
| September | Peak | 76.8°F |
| October | Peak | 65.9°F |
| November | High | 54.7°F |
| December | Moderate | 46.3°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near Arizona's larger cities, using the ~40°F activity threshold reported in published tick research. Real years run early or late with the weather.
Fleas peak later. Arizona flea season typically runs early February to early December — see the Arizona flea season page.
Frequently asked questions
When does tick season start in Arizona?
It never fully stops. Arizona's average temperatures sit above the ~40°F questing threshold all year, so tick checks and prevention are a twelve-month routine, with extra vigilance Mar–Nov.
What ticks live in Arizona?
The species dog owners most often meet in Arizona: brown dog tick, Rocky Mountain wood tick, American dog tick. Arizona's tick picture is unusual: the brown dog tick can finish its entire life cycle inside a house, kennel or garage, and in parts of the state it transmits Rocky Mountain spotted fever, so an indoor infestation here is treated as a health matter and not just a nuisance. Rocky Mountain wood ticks belong to the higher country around Flagstaff, appearing with spring warmth, and statewide pressure stays strong from March into November. Make the after-walk check a habit — ears, toes, groin, collar line — even when the outing was only around the neighborhood.
Do I need tick prevention in winter in Arizona?
Yes. Ticks overwinter under leaf litter and snow rather than dying off, and mild spells wake them — which is why veterinary organizations recommend year-round parasite prevention. The calendar shows when pressure peaks, not when protection can lapse.
What about fleas in Arizona?
Fleas run on a warmer calendar — in Arizona that's early February to early December. See the Arizona flea season page for that month-by-month picture.