What a fractional CMO actually does in the first 90 days
What a good fractional CMO does in the first 90 days — diagnose, prioritise, fix the measurement, ship early wins and build the plan. A realistic timeline.
Why the first 90 days matter
The first 90 days set whether a fractional engagement compounds or drifts. Because a fractional leader isn’t there full-time, the early weeks have to be disciplined: diagnose fast, prioritise ruthlessly, and ship enough early value to build trust and momentum. Here’s what a good fractional CMO actually does, roughly by phase — mapped to the 90-day growth plan structure.
Days 0–30: diagnose and prioritise
- Understand the business and the number. Commercial model, unit economics, current growth, and where the board wants to get to.
- Diagnose the constraint. Where growth is actually stuck — strategy, acquisition, conversion, measurement or pipeline. (Often formalised as a Growth Diagnostic.)
- Fix measurement if it’s broken. You can’t lead what you can’t see, so an early priority is a trustworthy view of CAC, payback and pipeline (see the measurement stack).
- Ship a quick win. One high-confidence improvement to build credibility and momentum.
Days 30–60: build the plan and the operating rhythm
- Set the growth plan. A prioritised set of bets tied to the primary metric, with owners.
- Establish the operating rhythm. The experimentation cadence, the reporting, the standards — the beginnings of the operating system.
- Align the team and agencies. Get everyone working to the plan; sort out any agency or resource issues.
Days 60–90: deliver and institutionalise
- Execute the priority bets and start showing movement on the number.
- Report to the board in commercial terms — early evidence the plan is working.
- Document the system so it outlasts any single person, and set the direction for the next quarter.
What good looks like at day 90
By the end of the first quarter you should have: a clear, prioritised growth plan; a trustworthy measurement view; an operating rhythm running; early wins on the board; and a leader the team and investors trust. Not everything fixed — but the system in place and momentum building.
Frequently asked questions
What does a fractional CMO do first?
Diagnose the real constraint and fix measurement if it’s broken — you can’t lead growth you can’t see — while shipping an early win.
How soon will we see results?
Early wins in the first month or two; meaningful movement on the primary metric by the end of the first quarter, depending on the constraint.
How is the first 90 days structured?
Diagnose and prioritise (0–30), build the plan and rhythm (30–60), deliver and institutionalise (60–90).
Want a fast, senior read on your growth to kick off the first 90 days? Request a Growth Diagnostic →
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