I live in MN and want to get the most riding I can in before it gets really cold and turns to snow. I plan to ride prior to transitioning to the 3 wk Foundation Plan. A this point, I am planning to start the 1st week of November to take a advantage of riding weather as much as I can. Is this date to late? What type of riding is best (z2, z3, intervals, etc…) during these upcoming warm periods prior to transitioning to the plan?