Glaciers are the only guarantee before December. A resort with skiing above 3,000 m can promise you something in November; everyone else is promising you weather. That is the whole logic of this ranking: Zermatt, Saas Fee, Engelberg and Laax sell certainty, Andermatt and Verbier sell upside when the storms arrive on schedule.
Book the bet, not just the resort. For a fixed November date, take the glacier resorts and accept the smaller open area. For a flexible long weekend you can move on ten days notice, Andermatt and Engelberg after the first big storm are some of the best skiing of the entire winter, at empty season prices.
Expect a different day shape. Early season means shorter daylight, high winds closing top lifts, and snow that lives only on the prepared ribbon, so plan around long lunches and treat off piste as closed until proven otherwise by a guide. Our Alps wide early season ranking compares these picks with Austria's glaciers, and the Switzerland guide covers rail transfers, which shine in November when mountain roads do not.