ABSTRACTSnow and frost measurements were made on a palsa mire in Utsjoki, northernmost Finland from September, 1984 to October, 1985. Snow cover was unusually thin and January and February were very cold. Frost penetrated in natural conditions down to maximum depth of 73 cm into the peat. Some of the frost stayed unmelted through the thawing season. Rather good multiple and logarithmic regressions were found between snow and frost depths of March and April. This type of condition makes possible a new palsa formation.