Separated from the Kullu Valley by the 3978m Rohtang La and from Spiti by the 4551m Kunzum La, Lahaul is greener and more developed than Ladakh and Spiti, but most travellers whistle straight through on the road between Manali and Leh, missing most of what Lahaul has to offer. The capital, Keylong, is an easy stop on the popular Leh to Manali bus trip and you can detour to a number of mountain villages and medieval monasteries that remain blissfully untouched by mass tourism.
Normally, government buses between Manali and Leh run from mid-July to mid-September, with private buses and shared minivans operating from late June to mid-October. Services as far as Keylong continue until the Rohtang La closes in November, and buses east to Kaza stop when the Kunzum La closes in October. Check the status of the passes before visiting late in the season – once the snows arrive, you might be stuck for the winter.