Denver sits an hour from the big Front Range resorts, so a day of ski lessons is an easy add-on for travelers. Expect a half-day or full-day group lesson with 4-8 people of similar ability. You'll spend the morning on basics (how to stop, turn, ride the lift) then do easy runs in the afternoon. The experience is cold, tiring, and surprisingly fun once the fear wears off. Instructors are generally patient but move at the group's pace; don't expect private attention unless you pay for it.
Best time is mid-January through early March when snow is reliable and crowds are lighter than Christmas week. Expect to pay around $180–$350 for a full-day group lesson including lift ticket and rentals; private lessons run $400–$650. Add another $80–$120 if you need to rent gear in Denver before heading up.
Pick a weekday lesson to avoid weekend crowds and long lift lines. Skip trying to do a morning lesson then drive back to Denver the same afternoon – traffic and tired legs make it miserable. Book the earliest slot available so you finish before the afternoon fatigue and flat light set in.