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We present here observational evidence that the snowline plays a significantrole in the formation and evolution of gas giant planets. When considering thepopulation of observed exoplanets, we find a boundary in mass-semimajor axisspace that suggests planets are preferentially found beyond the snowline priorto undergoing gap-opening inward migration and associated gas accretion. Thisis consistent with theoretical models suggesting that sudden changes in opacity-- as would occur at the snowline -- can influence core migration. Furthermore,population synthesis modelling suggests that this boundary implies that gasgiant planets accrete ~ 70 % of the inward flowing gas, allowing ~ 30$ %through to the inner disc. This is qualitatively consistent with observationsof transition discs suggesting the presence of inner holes, despite there beingongoing gas accretion.

How fast do Jupiters grow? Signatures of the snowline and growth rate in the distribution of gas giant planets