Can coaches challenge in the last minute or in overtime?

No. Teams can challenge at any time during the game except in the final minute of regulation or at any time in overtime (regular season and playoffs). In those windows, the exclusive right to start a review of any play that would otherwise be subject to a Coach's Challenge passes to the NHL Situation Room, which initiates the review itself.

For plays involving offside, a missed stoppage in the offensive zone, or goalkeeper interference, Hockey Operations first determines that the puck entered the net legally before the play is reviewed further, whether by challenge or by a league-initiated review.

If a team requests a challenge but the standard goal review makes it unnecessary, the challenge is treated as not having been made.

Source: NHL Official Rules 2026-2027, Rules 38.3 and 38.6.