Possible Clues:

• Leave stranded during winter, perhaps
• Trap post-blizzard
• Strand during a winter storm
• Trap at a winter lodge, say
• Strand by storm
• Don't allow to leave with odd characters out of discretion
• Strand during a wintry storm
• Make it so there's snow way out?
• Trap at a ski resort, say
• Trap, as by a winter storm