Access to Dewa Sanzan

I am in the Yamagata area, and noticed that the Echo Line road to Katta-san had already closed for winter. Does anyone know whether it is possible now to still visit Yudono-san, Haguro-san, or Gas-san?

You can go to Dewa Sanzan.
If you are traveling by car, you can get off at Yudonosan IC.

http://www.dewasanzan.jp/en/publics/index/44/
http://experiencetsuruoka.com/

Dewa Sanzan
I visited those places over two months ago. Fantastic places , especially the Hagurosan, must be mesmerizing with snow.
https://www.tohokuandtokyo.org/spot_56/

Haguro-san is open year round, though I can't imagine doing the hiking trail to the top in the snow because it's a lot of steps. It has the best bus connections from Tsuroka if you don't have a rental car.

Thank you!

If you decide to visit Dewa Sanzan , be sure to visit Ginzan onsen! Another "picture-perfect" with snow.

I was at Haguro-san just two weeks ago and you have to go before the snow hits because the majority of the trail up to the top are series of stairs. I cannot imaging tumbling down those steps in the snow. Despite that, you can "probably" still hike to the pagoda from the base of Haguro-san in the snow.

I could be wrong, but I assumed most people who visited Haguro-san in the Winter took the bus all the way to the top and didn't hike any of it. The stairs are quite steep and there will not be anyone to help you should you hurt yourself.

I've only been once and it was late April, but I would not have felt comfortable doing any of the steps with snow/ice and I live someplace where snow/ice in the Winter is fairly common place. When I went, I had limited time, so hiked to the top and then took the bus from the top back to Tsuroka vs. hiking back down again. I then caught a bus from Tsuroka to Yamagata and then another bus to Zao. Yudono-san wasn't open yet when I went through and after getting caught in a blizzard near Towadako I understood why.