Chase altitude and glaciers, because in spring height is everything. The resorts that ski reliably in April and May, led by Zermatt, Saas Fee and Engelberg, all sit on glaciers above 3,000 meters that hold snow long after the valleys turn green. If your dates are late, do not gamble on a low resort; the snow line climbs fast once the spring sun arrives.
Read the clock and the aspect, not just the resort. Late season snow is hard and fast first thing and slushy by afternoon, so start early, ski the shaded north faces in the morning and chase the softening south slopes after lunch. This is why high, varied mountains like Verbier, Andermatt and Davos shine in spring: they give you a choice of aspects to follow the sun around.
Trade crowds and cold for sunshine and value. Spring in Switzerland means warm terraces, long light and often lower prices outside the school holidays, which is a fine trade if you accept softer snow. Compare the timing in our France late season ranking and the wider picture in late season in the Alps, and plan the trip from the Switzerland destination guide.