In Michigan the calendar is the constraint
A short exterior season decides the year
Roofing, landscaping, paving and most exterior trades in Michigan have a limited number of workable weeks, and the business is effectively decided by how completely those weeks are filled. Demand is rarely the problem. Sequencing is.
Every day of the season spent working out what to do next, or ringing round to find out whether a customer quoted in October still wants the job, is capacity permanently gone. The businesses that do well treat winter as the period in which the backlog is built: quotes issued, work booked, and the queue sequenced so crews move between nearby properties rather than criss-crossing a county.
Winter revenue is sold in autumn
Seasonal service agreements and snow clearance contracts underwrite the quiet months, and they have to be signed before the weather makes them urgent. A contract negotiated during a storm, with an unhappy customer and no spare capacity, is a worse contract than one agreed in September.
Running renewals and confirmations as dated steps through early autumn is unglamorous and it is what makes a winter predictable. The alternative is discovering in December that the agreements everyone assumed were rolling over were never actually confirmed.