Monarch Butterflies in Rhode Island in September
Yes, September is one of the best months to see monarch butterflies in Rhode Island. It is the 2nd busiest month of the year, with 199 of the 772 sightings logged across the year (25.8%), 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 Rhode Island
25.8%
of yearly sightings
199
records in September
#2
busiest month of 12
772
verified records a year
August 31.3%, September 25.8%, October 11.7%. Busiest month is August at 31.3%.
772 verified observations of monarch butterflies in Rhode Island, recorded across 7 months of the year on iNaturalist.
When monarch butterflies are recorded in Rhode Island
Peak month
August
242 records (31.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 0 | 0% |
| May | 4 | 0.5% |
| June | 41 | 5.3% |
| Julypeak | 183 | 23.7% |
| Augustpeak | 242 | 31.3% |
| Septemberpeak | 199 | 25.8% |
| October | 90 | 11.7% |
| November | 13 | 1.7% |
| December | 0 | 0% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 772 |
In Rhode Island, September carries 25.8% of the year's monarch butterflies sightings, about 17.5 points above an even month-to-month split. That makes it the 2nd busiest of the twelve months, out of 7 months with recorded activity.
Activity is easing off from August (31.3%) into September, and it heads toward October (11.7%) 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 Rhode Island 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
- Monarch772 records
Plan your monarch butterfly trip in Rhode Island
Start with live tours near Blackstone River Valley National Historical Park, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Blackstone River Valley National Historical Park
Use the live GetYourGuide widget to compare local departures and activity styles close to the main monarch butterfly viewing area.
Booking.com
Stay nearbyStay near Blackstone River Valley National Historical Park
Compare hotels, cabins and lodges close to the best monarch butterfly viewing area in Rhode Island.
Viator
Broader backupBook a monarch butterfly tour in Rhode Island
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 Rhode Island in September?+
Yes. September accounts for 199 of the 772 verified monarch butterflies sightings logged in Rhode Island across the year, which is 25.8% of the annual total.
Is September a good time to see monarch butterflies in Rhode Island?+
September is one of the best months. It ranks 2nd of the year and sits inside the peak window of August, September and July.
What month is best for monarch butterflies in Rhode Island?+
August is the single busiest month, with the broader peak running through August, September and July, based on 772 verified observations.
Which monarch butterflies are you most likely to see in Rhode Island?+
The most-recorded species in Rhode Island are Monarch, based on all-time iNaturalist counts.
See monarch butterflies in Rhode Island in other months
More wildlife in Rhode Island