A study was conducted to determine the effecticity of concentration and soaking time of KNO3 on breaking dormancy on the ability to germinate oil palm seeds (Elaeis Guineensis Jacq.). The research was carried out a experimental field faculty of agriculture Muhammadiyah university of Yogyakarta from October to November 2018. This research used an experimental method with a completely randomized design (CRD) with one factor and 3 replications. The treatment was KNO3 with each concentration equal to 0,2%, 0,4% and 0,6% with soaking time 12 hours, 18 hours and 24 hours. Parameter observed were germination, speed of growing seeds, radicular length, plumula length, leaf dry weight and leaf area. This results showed that the concentration of KNO3 with a concentration 0,6% of immersion time of 18 hours obtained a germination value of 93,33% and the speed of growing seeds on the 0,98% (day).