In the same period, the number of overnights was up 20% on the year, reaching 1.3 million.
Foreign tourists generated 324,000 arrivals, up 24%, and 840,000 overnights, up 25% from the same period in 2014.
Tourist from Croatia recorded a 9% increase in arrivals and a 11% increase in overnight stays.
Tourism Minister Darko Lorencin said tourist spending would also go up.
Five strongest markets according to overnights in the first three months were Austria (66% more overnights), Germany (21% increase¸), Slovenia (13% increase), Italia (6% increase) and Bosnia and Herzegovina (11% increase).