The snow pack at Big M is holding up well. When it is below freezing the trails are in AMAZING shape. Things soften up greatly in the warmer temps though so don’t be a jerk and ride it when the trails are soft (you leave more than a 1″ rut).
Based on the forecast you probably shouldn’t ride the trails on Saturday because it will not drop below freezing Friday night. Saturday night is supposed to drop below freezing so riding should be great Sunday early morning until things warm up a ton and the trail softens up.