Spirit: Can I bring my skis on my trip?
You betcha! Put them in a bag and get ready to hit the slopes, or the lake. Ski equipment (water or snow) is charged as a standard checked bag. Please be mindful overweight (over 40 pounds /18.1 kg) and oversized (over 62 inches / 157.48) baggage costs more.
A limited liability release will need to be signed when traveling with skis or snowboards.
Since many skies are 62"+ (and a ski bag adds at least a little length), your bag is likely to be oversize, which will result in a substantial extra charge on top of the regular baggage fees. Plus you'll need to pay a baggage fee for your skies, and another for your boot bag, and one for the rest of your belongings. Spirit, a low-cost-carrier, is particularly known to be strict and unyielding when it comes to their fees.
Even if the fare is more expensive, you very well may come out ahead on another airline, as carriers like United, American, and Southwest (which gives you two checked bags for free) will treat skis and a boot bag as a single item and won't charge overlength fees on standard skis.