Mass. Gen. Laws ch. 143 § 71P
For the purpose of sections seventy-one I to seventy-one R, inclusive, in any action brought against a ski area operator based on negligence, it shall be evidence of due care where the conduct of an operator has conformed with the provisions of this chapter or rules or regulations of the board made pursuant to section seventy-one J.
No action shall be maintained against a ski area operator for injury to a skier unless as a condition precedent thereof the person so injured shall, within ninety days of the incident, give to such ski area operator notice, by registered mail, of the name and address of the person injured, the time, place and cause of the injury. Failure to give the foregoing notice shall bar recovery, unless the court finds under the circumstances of the particular case that such ski area operator had actual knowledge of said injury or had reasonable opportunity to learn of said injury within said ninety-day period, or was otherwise not substantially prejudiced by reason of not having been given actual written notice of said injury within said period. In a case where lack of written notice, actual knowledge, or a reasonable opportunity to obtain knowledge of any injury within said ninety-day period is alleged by such ski area operator, the burden of proving substantial prejudice shall be on the operator.
An action to recover for such injury shall be brought within one year of the date of such injury.
Mass. Gen. Laws ch. 143, § 71P