 Chestnut is hardy to zone 5, which is lower in average minimal temperature than London in zone 9.The young growth in spring, even on mature plants, though, is frost-tender; bud-burst is later than most other fruit trees, so late frosts can be damaging to young buds.Trees can be found at altitudes between 200 and 1000 m above sea level; some mention between 300 and 750 m altitude, while the famous Chestnut Tree of One Hundred Horses on Mount Etna stands at 1200 metres.