Jackelberg, Mountain summit in Bavarian Alps, Germany

Jackelberg is a rocky, wooded ridge in the Wendelstein group of the Mangfall Alps, rising to a main summit of 1412 metres and an eastern secondary summit of 1312 metres. On its southern slope stand the Jackelberg-Alm at 1135 metres and, right beside it, the Kelheimer Hütte of the German Alpine Club, built 1961–1964 on a large rubble-stone base.

The Jackelberg-Alm was originally owned by Otto von Steinbeis, builder of the Wendelstein cog railway, who later exchanged it for the Kogler Alm on the steep eastern slope of the Wildalpjoch; that pasture was abandoned before 1951. The Kelheimer Hütte was built in 1961–1964 as a shelter of the DAV Kelheim section next to the pasture, and the small private Wittmann-Hütte below it dates from 1947. The Steinbeiss-Hütte, southwest of the main summit, began as a pasture hut in 1787, was later bought by Steinbeis and was rebuilt and raised after the war.

The Jackelberg-Alm at 1135 metres is a staffed pasture (Jausenalm) in private ownership, grazed mainly by cows in summer and autumn. Its massive, lightly plastered 20-metre Kaser with attached stall stands on the south slope. The pasture once belonged to Otto von Steinbeis, who traded it for the Kogler Alm on the steep east flank of the Wildalpjoch, closed before 1951.

Access starts from Federal Road 307, where a service road leads toward the Alpine pasture and opens up several hiking trails. Come prepared for changing weather and wear sturdy shoes, as trail conditions vary with the seasons.

The Arzmoos waterfall drops about 30 metres where the Arzbach falls from the upper to the lower Arzmoos, at the eastern foot of the Jackelberg. An old, abandoned adit lies near the waterfall. No marked path leads to the summit; a summit book has been kept there since 2015.