Mont. Code Ann. § 39-51-2109

Effective January 1, 1978, benefits shall not be paid to any individual on the basis of any services, substantially all of which consist of participating in sports or athletic events or training or preparing to so participate, for any week which commences during the period between 2 successive sport seasons or similar periods if such individual performed such services in the first of such seasons or similar periods and there is a reasonable assurance that such individual will perform such services in the later of such seasons or similar periods.