Monarch Butterflies in Oregon in September
Yes, September is a good month to see monarch butterflies in Oregon. It is the 4th busiest month of the year, with 88 of the 577 sightings logged across the year (15.3%), 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.
Good month for monarch butterflies in Oregon
15.3%
of yearly sightings
88
records in September
#4
busiest month of 12
577
verified records a year
August 24.4%, September 15.3%, October 4.9%. Busiest month is June at 28.4%.
577 verified observations of monarch butterflies in Oregon, recorded across 7 months of the year on iNaturalist.
When monarch butterflies are recorded in Oregon
Peak month
June
164 records (28.4% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 0 | 0% |
| May | 17 | 2.9% |
| Junepeak | 164 | 28.4% |
| Julypeak | 136 | 23.6% |
| Augustpeak | 141 | 24.4% |
| September | 88 | 15.3% |
| October | 28 | 4.9% |
| November | 3 | 0.5% |
| December | 0 | 0% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 577 |
In Oregon, September carries 15.3% of the year's monarch butterflies sightings, about 7 points above an even month-to-month split. That makes it the 4th busiest of the twelve months, out of 7 months with recorded activity.
Activity is easing off from August (24.4%) into September, and it heads toward October (4.9%) after. The busiest month is June (28.4%), so if timing is flexible, that window is the safer bet.
The monarch butterflies most often recorded in Oregon 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
- Monarch577 records
Plan your monarch butterfly trip in Oregon
Start with live tours near Crater Lake National Park, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Crater Lake National Park
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 Crater Lake National Park
Compare hotels, cabins and lodges close to the best monarch butterfly viewing area in Oregon.
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Broader backupBook a monarch butterfly tour in Oregon
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 Oregon in September?+
Yes. September accounts for 88 of the 577 verified monarch butterflies sightings logged in Oregon across the year, which is 15.3% of the annual total.
Is September a good time to see monarch butterflies in Oregon?+
September is the 4th busiest month. It is workable, though June and August is the stronger window for a reliable sighting.
What month is best for monarch butterflies in Oregon?+
June is the single busiest month, with the broader peak running through June, August and July, based on 577 verified observations.
Which monarch butterflies are you most likely to see in Oregon?+
The most-recorded species in Oregon are Monarch, based on all-time iNaturalist counts.
See monarch butterflies in Oregon in other months
More wildlife in Oregon