Monarch Butterflies in Wyoming in September
Yes, September is one of the best months to see monarch butterflies in Wyoming. It is the 3rd busiest month of the year, with 30 of the 150 sightings logged across the year (20%), based on verified iNaturalist records.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Peak month for monarch butterflies in Wyoming
20%
of yearly sightings
30
records in September
#3
busiest month of 12
150
verified records a year
August 36%, September 20%, October 15.3%. Busiest month is August at 36%.
150 verified observations of monarch butterflies in Wyoming, recorded across 8 months of the year on iNaturalist.
When monarch butterflies are recorded in Wyoming
Peak month
August
54 records (36% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 1 | 0.7% |
| May | 1 | 0.7% |
| June | 7 | 4.7% |
| Julypeak | 33 | 22% |
| Augustpeak | 54 | 36% |
| Septemberpeak | 30 | 20% |
| October | 23 | 15.3% |
| November | 1 | 0.7% |
| December | 0 | 0% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 150 |
In Wyoming, September carries 20% of the year's monarch butterflies sightings, about 11.7 points above an even month-to-month split. That makes it the 3rd busiest of the twelve months, out of 8 months with recorded activity.
Activity is easing off from August (36%) into September, and it heads toward October (15.3%) after. This is right inside the peak window, so September is one of the surest months to plan a trip around.
The monarch butterflies most often recorded in Wyoming are Monarch. Those counts are annual totals rather than a September split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in September itself.
Which monarch butterflies you are most likely to see
- Monarch150 records
Plan your monarch butterfly trip in Wyoming
Start with live tours near Bighorn Canyon National Recreation Area, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
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Live tours nearbySee live tours near Bighorn Canyon National Recreation Area
Use the live GetYourGuide widget to compare local departures and activity styles close to the main monarch butterfly viewing area.
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Stay nearbyStay near Bighorn Canyon National Recreation Area
Compare hotels, cabins and lodges close to the best monarch butterfly viewing area in Wyoming.
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Broader backupBook a monarch butterfly tour in Wyoming
Compare guided wildlife tours, boat trips and nature experiences if you want a second travel network beyond the live widget.
Frequently asked questions
Can you see monarch butterflies in Wyoming in September?+
Yes. September accounts for 30 of the 150 verified monarch butterflies sightings logged in Wyoming across the year, which is 20% of the annual total.
Is September a good time to see monarch butterflies in Wyoming?+
September is one of the best months. It ranks 3rd of the year and sits inside the peak window of August, July and September.
What month is best for monarch butterflies in Wyoming?+
August is the single busiest month, with the broader peak running through August, July and September, based on 150 verified observations.
Which monarch butterflies are you most likely to see in Wyoming?+
The most-recorded species in Wyoming are Monarch, based on all-time iNaturalist counts.
See monarch butterflies in Wyoming in other months
More wildlife in Wyoming