Storage units come in many different sizes, and the monthly rates are quite reasonable ($20-$30 per month plus a deposit fee). If you only have a few things to store, try to find a friend who will split the unit and the bill. Storage units usually have monthly leases, but are often prorated for students in your exact situation. There are many different storage unit companies in La Crosse, but plan ahead, because they fill up quickly for the month of May.
Edwards Mini Storage
901 Rose Street
La Crosse, WI 54603
Phone: (608) 785-1770
Stor-It Mini Warehouse
122 Cass Street
La Crosse, WI 54601
Phone: (608) 783-1587
To see more options, visit the online yellow pages.