VAN-COMPARATOR Guide
Reading the weather before a mountain pass: wind, snow, and when to turn back
Side gusts, early snow, closed passes: how to read mountain weather with a tall vehicle, and the thresholds beyond which you change your route.
A motorhome presents 7 to 10 m² of side area to the wind and puts 3.5 t on van-sized brakes: in the mountains, the weather is not a comfort detail but a driving input. Here is how to read it — and when to turn back.
Wind: enemy number one of the tall vehicle
From 60–70 km/h gusts, a semi-integrated gets shoved around on viaducts and exposed ridges; beyond 80–90 km/h, you do not go — several countries actually close exposed bridges and corridors to high-sided vehicles in those conditions. Check the gusts (not just the mean wind) on the national warning map the evening before and again in the morning. The Rhône valley mistral, the foehn in Alpine valleys: wind corridors are known and predictable.
Snow: earlier than you think
Above 2,000 m it can snow from late September. In France, the Mountain Law requires winter tyres or chains from 1 November to 31 March in designated zones — check the vehicle’s equipment BEFORE booking; not all owners supply chains. The great Alpine passes (Iseran, Stelvio, Grossglockner) close from autumn to spring: check opening status on the passes’ official sites, not on your sat-nav.
The three monitoring reflexes
The day before: the massif forecast (gusts, freezing level, precipitation). In the morning: pass webcams — nothing lies less than an image. On the road: pass-status boards in the valley, posted before every climb.
Turning back is not losing
There is almost always a plan B: the tunnel under the pass, the parallel valley, or a 24-hour wait — and waiting somewhere warm is precisely a motorhome’s superpower. Our Alps road trip lists the most drivable crossings, and our beginner driving guide completes the preparation.