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In 2023, I cycled Tusenmeteren in Mid June already but Slettefjellet was still closed.
Maybe you could check with the local tourist info: https://www.valdres.com/things-to-do/slettefjellrunden-cycling-tour-p611443
valdres.com
Slettefjellrunden cycling tour
57,5 km - Slettefjellrunden is a spectacular but demanding cycling tour. It contains a tough climb from the toll station at Slettefjellvegen up to…