The classic question. Refrigerating film slows the chemical changes that eventually fog or shift it, so for film you won't shoot soon, cold is good. But room temperature in a stable, dry, dark place is usually enough — and avoids the bigger risk: condensation.
Cold film pulled into a warm camera body or warm air will sweat. Moisture on the emulsion is worse than the heat you were trying to avoid. So if you do fridge, let the rolls warm up sealed for at least two hours before opening.
What matters more than temperature: keep it sealed, keep it stable, keep it away from light, and shoot it before the expiry mark stops being aspirational.