The closest skiing to Portland is on Mount Hood, approx 1-1:30 east of Portland. Spring skiing is some the best during the year and your dates are perfect for the spring deals. Ski Bowl and Timberline have what’s called the Fusion pass which is generally priced between $99-$129 and Mount Hood Meadows has a spring pass for about $129. The pass is good till the end of the season, generally mid-May. If you intend on skiing more than one day the pass more than well pays for itself.