It's freezing here but no snowmobiles; that's probably a tall order for anyone who doesn't own one. Even though it's freezing, I'd bring the bike out some challenges!
We could go back (if it was ever even a semi-official rule) to 'one week challenges': e.g. if your challenge stands for a week, it is mothballed and a new challenge issued.
And maybe tack on a day for the original poster to come up with a new challenge. After that, first come, first served!
I don't mind really, but win-able challenges keep the game moving!
I say find some snowmobiles..anyone in a northern region has a shop selling or repairing them somewhere ...heck, some folks even have on trailers in their front yard ready to go when the snow falls... go out and find some.
I can say with no un-certainty that there are no snow mobile dealers, shops, owners, riders, or even a picture of a snow mobile in North Central Texas.