Andrew C.
Yelp
Hoheikyo is one of the most "unique" onsen that is offered on the "Day Trip Package" (https://jozankei.jp/en/pac for reference) because it is the only one who offers an OUTDOOR onsen and is not part of a hotel. The package is available to purchase at Sapporo Station Bus Terminal for 2000 yen per person (includes bus ride to/from and admission into the onsen).
Hoheikyo Onsen is the last stop on this bus ride and is also the first to get picked up. For those with TATTOOS, this onsen IS TATTOO FRIENDLY ! Most unfortunately do not.
Upon entry to the onsen, there are lockers for shoes at a small fee. There is also an option to put them on trays on TOP of the lockers too (at your own risk). After walking past a small waiting area, you see the INDIAN restaurant and where you pay (normally). Since we were part of the package, we still had to pay a different "mandatory" item, a small towel (200 yen?). You have the option to "rent" a large towel too but not needed. I asked the guy there and said most Japanese just wring out the small towel and keep wiping. LOL
After you get your towel, you want upstairs. There are large rooms for people to "chill" at afterwards and a massage area (for an additional fee). Lots of vending machines along the way. Near the "end", you'll arrive at the male and female baths (separated of course). With a small turning divider, you'll first get to a locker room. Each locker costs 100 yen but money is returned when key is re-inserted. Baths are FULLY NUDE so you only are allowed the small towel. There is a single person toilet in the locker room, or you can walk out and go back down for some more toilets.
As proper bath house etiquette, you are recommended to shower and clean first before using the hot springs. Shampoo and body wash is provided.
Each gender has 2 hot springs. One inside, by the showers, one outside, through 2 doors. Most people who come to this onsen will primarily use the outdoor one. Good luck finding a good spot to chill at outside. The water temperature is not bad. Not too hot. I was sitting near but not in front of where the water was coming down. After a while, there was an attendant who came to check the temperature and adjust the spout thing. By the "covered" area, there seemed to be a "table", good for people who has a large group to hang around.
Too bad phones are not allowed but pictures on the site (link above) gives you a pretty good idea on how it looks like. It had snowed recently in Sapporo so there are some hints of snow here and there but it was not snowing during my visit.
There are vending machines everywhere, Indian sit down restaurant, and some drinks available at the front desk. There's like an ice cream shop too but it wasn't open when I was there.
Overall, pretty good experience. No WiFi at the onsen, which made it a mild issue when we were trying to get back together with my friends due to a miscommunication. There are bus schedules online and at the station but they are mildly confusing to look at. There is one at the bus stop as well if you want to check again before going into the onsen.
I'd recommend this place. There aren't many outdoor onsens. Breathing in fresh cold mountain air while sitting in a hot bath, its fairly easy to just close your eyes, top your head with a semi wet warm towel, and just relax on the side. Only thing is you'd have to be ok with being fully naked while having people of the same gender who are also fully naked around you, but that's an issue for all onsen, unless you had one in your own room or something.
Takes about 50-60 minutes each way, and you should give yourself at least a good 2 hours at the place. So plan accordingly.