We got caught on the BRP once, left and the temps were fine, but once up there, a cold front blew in like a big dog. We were totally unprepared clothing wise, but couldn't get off the the parkway. The water from the streams rolling down the rocks was freezing. Luckily, we found a little tourism center that had a fire going inside. I was never so happy to get off a bike, but we still had to leave and ride until we found an exit and back to my buddy's hanger.