https://davesredistricting.org/join/93ef9a79-f68e-4edc-8292-e0c057e6c045So now that Montana's officially regaining a second seat, I gave it a go with an East-West map.
The eastern district (MT-02) is very much safe R. The only spots where Democrats are remotely competitive are downtown Billings and some reservation areas.
But the western district (MT-01) is interesting. Trump only won it by around 8 points against Hillary, while Tester in 2018 and Bullock in 2016 both carried it by double digits. I doubt Biden won it, but it was likely within 5 points. I think this would be a true swing district, although there are some very favorable trends for Democrats in Missoula and Bozeman.