Several excellent day hikes can easily be undertaken from Siglufjörður. The trails described below are shown on the hiking map of Siglufjörður available at the herring museum.
The best of the shorter routes (5–7hr), forming a clockwise circle around the town, begins at the southern edge of Siglufjörður, where the road veers left around the head of the fjord. Follow the walking path up Eyrafjall, heading towards the Dalaskarð pass, then over the mountain tops and up Hafnarfjall, from where there’s an excellent view over the fjord, the surrounding peaks and even Grímsey. From here it’s an easy climb up Hafnarhyrna (687m), the highest point on Hafnarfjall and the starting point for the easy descent towards the bowl-shaped hollow of Hvanneyrarskál, a well-known lovers’ haunt during the herring boom. From this hollow, a road leads back down into town.
A second, longer trail (10–14hr) begins beyond the disused airport on the eastern side of the fjord (follow the main road through the village to get there) and leads southeast up the valley of Kálfsdalur, which begins just above the lighthouse beyond the airport, past Kálfsvatn lake, over the Kálfsskarð pass (450m) before descending into Nesdalur valley on the other side of the ridge. The trail then leads north through the valley to the coast and the deserted farm, Reyðará. From the farm, the trail leads west along the steep slopes of Nesnúpur (595m), passing a lighthouse and several abandoned huts, built by the American military during World War II as a radar station. Once back on the eastern side of the fjord the path trail continues along the shoreline, towards the disused airport and Siglufjörður.