The limit is the radiusSection 3
When the Pass Is Shut
The Stelvio opens in late May. Everything planned around its forty-eight bends before then is planned around a closed road.

Closure Seasons and What They Mean for the Route
Italy's high passes follow a rough calendar, but it is a calendar governed by snowfall, not dates printed in advance. The Stelvio Pass, at 2,757 metres the highest paved road in the eastern Alps, typically opens sometime between late May and mid-June on its north side from Prato allo Stelvio; the south approach from Bormio tends to clear a few weeks earlier. Both close again by November, and in a heavy winter, earlier. ANAS, the Italian national roads agency, publishes current status for state roads, and the pass sits on the SS38 designation — but even their updates lag behind an overnight dump of snow.
The Dolomites carry a different pattern. The Pordoi, the Falzarego and the Gardena passes sit lower than the Stelvio but still close between October and May, sometimes with short reopening windows during settled spells that can shut again within days. Road managers post closures on regional authority sites; none of them is synchronized. A route that crosses four passes in the eastern Dolomites can be half-open on any given morning in early June and needs checking pass by pass, not region by region.

For a van the issue compounds. Length and turning circle already constrain which passes are viable at all, and winter diversion routes — typically the longer valley roads through Merano or the Adige corridor — were designed for the through-traffic of lorries and coaches, not optimised for camping. The signed diversionary routes that bypass weight-limited bridges in the valleys can push a van thirty kilometres off a direct line. In spring and autumn those detours are not a backup plan so much as the actual plan.
What changes out of season is not just access to the pass itself. The sostas at altitude, and the rifugi that give the high road its logic as a destination, close with the snow. The village of Prato allo Stelvio retains services year-round; the road above it does not. Tuscany poses a different kind of shut — less snow, but the SR roads over the Apennines into Lucca or down toward the Maremma flood in autumn and carry landslide restrictions that close unpredictably and can persist for weeks, as ANAS road status data reflects.
The practical consequence is that any route drawing on high ground between October and late May needs a valley alternative pre-planned, not improvised at the barrier. The barrier, when it appears, settles nothing — because often there is no barrier, just a road that stops.
