Doesn't seem like much of a partisan pattern, honestly. May reflect more when ballots where first mailed out or how quickly counties are updating their tallies.
I assume these counties are all all-mail? I know a handful of mostly small MT counties are still doing in-person voting but not sure which ones.
Yeah, it’s not much of a partisan pattern and mostly driven by logistical/administrative factors (hence the Flathead vs. Lewis and Clark discrepancy).
Yes, all of these counties are all-mail; only eleven counties won’t be conducting an all-mail election: Broadwater, Carbon, Chouteau, Fergus, Mineral, Petroleum, Powder River, Powell, Stillwater, Treasure, Wibaux.
Absentee/mail-in voting in MT was already in widespread use even before COVID-19 (IIRC, something close to 75% of all ballots in 2018 were absentee).