Therfield Heath

Therfield Heath sits on the Hertfordshire-Cambridgeshire border where 150 acres of chalk grassland and scrub cover an open common with views extending for miles on clear days. The 8 km circuit crosses genuine open ground without formal waymarking, threading paths across windswept grassland dotted with ancient tumuli and thick gorse. The chalk substrate creates a distinctive flora — orchids in summer, aromatic herbs in the warm months — and the rabbit population thriving in warrens beneath the turf keeps the ground constantly active with movement and scent. At just 107 metres of elevation gain, the walking is gentle but the exposure to wind and sky gives it a character quite different from the sheltered lanes and woodlands typical of this part of England.

Dogs who crave wide open space will be in their element on this dog friendly walk. The grassland allows genuine freedom to run when livestock are absent, and the rabbit warrens keep noses working constantly across every section. Scent behaves differently here than in woodland — the wind carries it freely across the open ground, creating a more dynamic and unpredictable environment that keeps dogs alert and engaged. Moderate livestock presence means checking conditions before letting dogs off lead is wise. The lack of prescribed routes makes this genuine exploration rather than following a set trail, and the heath stays remarkably quiet despite being accessible from Royston. Terrain is gentle enough for dogs of all fitness levels.