Jellyfishes in Oregon in October
Yes, October is a good month to see jellyfishes in Oregon. It is the 4th busiest month of the year, with 373 of the 3,455 sightings logged across the year (10.8%), 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 July 2, 2026.
Good month for jellyfishes in Oregon
10.8%
of yearly sightings
373
records in October
#4
busiest month of 12
3,455
verified records a year
September 23.1%, October 10.8%, November 5%. Busiest month is August at 27.1%.
3,455 verified observations of jellyfishes in Oregon, recorded across 12 months of the year on iNaturalist.
When jellyfishes are recorded in Oregon
Peak month
August
935 records (27.1% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 111 | 3.2% |
| February | 98 | 2.8% |
| March | 54 | 1.6% |
| April | 25 | 0.7% |
| May | 66 | 1.9% |
| June | 228 | 6.6% |
| Julypeak | 478 | 13.8% |
| Augustpeak | 935 | 27.1% |
| Septemberpeak | 798 | 23.1% |
| October | 373 | 10.8% |
| November | 173 | 5% |
| December | 116 | 3.4% |
Jellyfishes you are most likely to see
| Species | Verified observations |
|---|---|
| Pacific Sea Nettle | 1,217 |
| Greater Moon Jelly | 856 |
| Pacific Lion's Mane Jelly | 786 |
| Egg-yolk Jelly | 116 |
| Purple-striped Sea Nettle | 9 |
| Barrel Jellies | 1 |
In Oregon, October carries 10.8% of the year's jellyfishes sightings, about 2.5 points above an even month-to-month split. That makes it the 4th busiest of the twelve months, out of 12 months with recorded activity.
Activity is easing off from September (23.1%) into October, and it heads toward November (5%) after. The busiest month is August (27.1%), so if timing is flexible, that window is the safer bet.
The jellyfishes most often recorded in Oregon are Pacific Sea Nettle, Greater Moon Jelly and Pacific Lion's Mane Jelly. Those counts are annual totals rather than a October split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in October itself.
Which jellyfishes you are most likely to see
- Pacific Sea Nettle1,217 records
- Greater Moon Jelly856 records
- Pacific Lion's Mane Jelly786 records
- Egg-yolk Jelly116 records
- Purple-striped Sea Nettle9 records
- Barrel Jellies1 records
Plan your jellyfish 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 jellyfish viewing area.
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Stay nearbyStay near Crater Lake National Park
Compare hotels, cabins and lodges close to the best jellyfish viewing area in Oregon.
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Broader backupBook a jellyfish 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 jellyfishes in Oregon in October?+
Yes. October accounts for 373 of the 3,455 verified jellyfishes sightings logged in Oregon across the year, which is 10.8% of the annual total.
Is October a good time to see jellyfishes in Oregon?+
October is the 4th busiest month. It is workable, though August and September is the stronger window for a reliable sighting.
What month is best for jellyfishes in Oregon?+
August is the single busiest month, with the broader peak running through August, September and July, based on 3,455 verified observations.
Which jellyfishes are you most likely to see in Oregon?+
The most-recorded species in Oregon are Pacific Sea Nettle, Greater Moon Jelly and Pacific Lion's Mane Jelly, based on all-time iNaturalist counts.
See jellyfishes in Oregon in other months
More places to see jellyfishes
More wildlife in Oregon