Many rental car companies offer “ski deals” in the form of promotional codes that are valid during ski season. Here are a few examples of deals you can find online:

Hertz:  You can save $10 a day and up to $50 off an SUV rental by visiting the ski deal section of their website and redeeming this coupon.

Avis: Avis offers a variety of online discounts, including $25 off weekly rentals, $20 off weekend rentals, complimentary days and 25 percent off your next rental.

Budget: Save up to 20 percent with Budget by using coupon BCD D444700 when booking.  

Upgrade at the Counter for Big Savings: A good trick to saving money on car rentals comes from taking advantage of the fact that many car rental employees get rewarded for upsells, even if they end up renting a vehicle for cheaper than its current rate. The main goal is to get the customer to spend more than they intended.

You can reap the benefit of this assuming there is availability. It’s a good trick, but not 100 percent reliable—something to keep in mind depending upon how flexible you are with your travels.