Heading to Snake River, Bald Eagle, Gabbro area next week. Are there any fire bans in effect anywhere?

Bob.

Based on this, I'd say your good to go:

http://www.dnr.state.mn.us/forestry/fire/firerating_restrictions.html

Are fire bans common? Generally what time of the year should you plan on that possibility?

I have had fire bans in early spring before things green-up and in the dry time of the fall.

I finished up there two weeks ago and it had been pretty rainy and cold. I don't think there has been a lot of high temps and winds since which could dry things out, but you can always call the local ranger station and ask them their current fire risk rating. I doubt we are anywhere near a ban anywhere in the BWCA right now.

It's supposed to rain much of next week, when I'm there.

quote A1t2o: "Are fire bans common? Generally what time of the year should you plan on that possibility?"

Back in the early 2000s I had several August trips where fire bans were in place.