These days, fathers in Colorado are more likely to get joint custody. This is a big change from what was commonplace for much of the prior century. Mothers were granted sole custody in roughly 80% of cases in 1980. Nearly three decades later, this was true about 40% of the time.
Most courts today favor and encourage joint custody or equal parenting arrangements. However, it's legal custody of a child that's more likely to be equal among both parents. Mothers are still favored with residential/physical custody, which refers to where a child primarily resides. This discrepancy is typically due to logistical issues, especially with school-age children.