Bitcoin averaged an 18.52% October gain from 2013 through 2025, with a 12.73% median gain and positive returns in 10 of 13 years. October 2013 delivered the strongest increase at 60.79%, while October 2014 recorded the largest decline at 12.95%. Bitcoin was recently trading near $84,000, and Kalshi contracts gave it a 52% chance of exceeding $91,000 this October, although higher Treasury yields and a stronger U.S. dollar could weigh on demand.