The rules for ice golf really depends on the golf course and the people you’re playing with.
Playing in snowdrifts and subzero temperatures usually requires a certain flexibility when applying the rules.
In Greenland’s World Ice Championship, for example, the rules are the same as for regular golf, with a few exceptions:
Players are allowed to sweep their putting lines clean with a broom on the “whites”, there are no greens in winter golf.
Balls on the fairway can be played off rubber tees, while balls in the rough can be moved a few inches without penalty if otherwise unplayable.
The holes are twice the size of a standard golf cup.
Although not mandatory, purple or yellow optic balls are encouraged.
Finally, the starting tee is moved a third of the way up the fairway for winter golf, because subzero temperatures freeze the balls solid and thus make any golf shot 30% shorter than it would be in shirtsleeve weather.