Prelimnary information said a grenade was hurled at the wine shop at Narwal, south of Jammu city, at 1910 hours, police said.
One person identified as Kuldeep Raj, a resident of Akhnoor succummed to inuries while five others -- Amarnath, Rajinder Singh, Rakesh Singh, Ramu and Pradeep Kumar -- were being treated at various hospitals.
Police were ascertaining the nature of the explosion.
This is the second attack on a wine shop in the state and Pakistan-based Hizbul Mujahideen are suspected to be behind it.
One person was killed and four others injured when militants had attacked a wine shop in Dalgate area of Srinagar earlier this week.