Best Time to See Monarch Butterflies in Arizona
October, November and September is the best time to see monarch butterflies in Arizona. Based on 2,392 verified iNaturalist observations, here is exactly when monarch butterflies are most active across the year in Arizona.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
2,392 verified observations of monarch butterflies in Arizona, recorded across 12 months of the year on iNaturalist.
When monarch butterflies are recorded in Arizona
Peak month
October
409 records (17.1% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 173 | 7.2% |
| February | 131 | 5.5% |
| March | 147 | 6.1% |
| April | 122 | 5.1% |
| May | 70 | 2.9% |
| June | 30 | 1.3% |
| July | 85 | 3.6% |
| August | 204 | 8.5% |
| Septemberpeak | 340 | 14.2% |
| Octoberpeak | 409 | 17.1% |
| Novemberpeak | 404 | 16.9% |
| December | 277 | 11.6% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 2,392 |
Weather to expect, source Open-Meteo
Typical weather in Arizona
Recent typical conditions by month, so you can plan a trip around both when monarch butterflies are active and what the weather is doing. The best months to look for monarch butterflies sit around 43 to 84 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 52°F | 34°F | 1.9" |
| Feb | 52°F | 34°F | 1.9" |
| Mar | 58°F | 39°F | 2.7" |
| Apr | 71°F | 49°F | 0.2" |
| May | 77°F | 56°F | 0.3" |
| Jun | 88°F | 66°F | 0.3" |
| Jul | 91°F | 72°F | 2.7" |
| Aug | 88°F | 70°F | 2.2" |
| Sepbest time | 84°F | 64°F | 1.4" |
| Octbest time | 73°F | 52°F | 0.6" |
| Novbest time | 63°F | 43°F | 1.5" |
| Dec | 53°F | 36°F | 2" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Arizona. Weather varies year to year, so treat these as a guide.
Sightings of monarch butterflies in Arizona peak in October, when 409 of the year's 2,392 verified observations are logged — about 17.1% of the annual total. Activity stays high through October, November and September.
The quietest stretch is June, when monarch butterflies are hardest to find — June sees just 30 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The monarch butterflies you are most likely to encounter in Arizona are Monarch — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see monarch butterflies in Arizona
- Chiricahua National Monument — National Monument
- Coronado National Memorial — National Memorial
- Fort Bowie National Historic Site — National Historic Site
- Grand Canyon National Park — National Park
- Lake Mead National Recreation Area — National Recreation Area
- Montezuma Castle National Monument — National Monument
Frequently asked questions
What is the best month to see monarch butterflies in Arizona?+
October is the single best month, and the broader peak window runs through October, November and September, based on 2,392 verified iNaturalist observations.
When are monarch butterflies hardest to see in Arizona?+
June is the quietest month for monarch butterflies in Arizona, with only 30 verified records.
Are monarch butterflies active year-round in Arizona?+
Monarch butterflies are recorded in 12 of 12 months in Arizona, so they can be seen year-round, with a clear peak in October.
More places to see monarch butterflies
More wildlife in Arizona