Interim CMO vs. Fractional CMO vs. Fractional Head of Growth: Which Does Your B2B Scale-Up Need?
Short answer: an interim CMO fills a full-time leadership vacancy temporarily while you hire permanently. A fractional CMO is a permanent part-time executive who owns marketing strategy long-term. A fractional Head of Growth is narrower and more hands-on, focused specifically on pipeline, demand generation, and revenue outcomes rather than the full marketing function. Most B2B tech scale-ups asking this question actually need the third option.
The three models, compared
| Interim CMO | Fractional CMO | Fractional Head of Growth | |
|---|---|---|---|
| Time horizon | Temporary (until a permanent hire) | Ongoing, indefinite | Ongoing, indefinite |
| Scope | Full marketing function | Full marketing function | Demand gen, pipeline, GTM execution |
| Time commitment | Full-time | 1–3 days/week | Varies (retainer or project-based) |
| Best for | A marketing leadership gap you're actively backfilling | Companies that never want a full-time CMO | Companies that need pipeline results, not a marketing department |
| Typical cost | Full-time salary equivalent | $8,000–$15,000/month | Varies by scope (often lower than a full CMO retainer) |
| Accountability | Runs the existing team as-is | Builds and owns marketing strategy | Owns specific revenue/pipeline metrics |
When an interim CMO makes sense
You have a marketing team and a marketing budget, but the seat at the top is empty: someone left, or you're mid-search for a permanent hire. An interim CMO's job is continuity: keep the team executing, keep the roadmap moving, and hand off cleanly once you've hired. It's a bridge, not a long-term structure.
When a fractional CMO makes sense
You're too early or too lean to justify a full-time CMO salary, but you need someone who owns the entire marketing function (brand, content, demand gen, team management) at a strategic level. A fractional CMO typically shows up 1–3 days a week and is accountable for the whole marketing org, not just pipeline.
When a fractional Head of Growth makes sense
This is the model most B2B tech and SaaS founders are actually looking for when they start Googling "fractional CMO." You don't need someone to build a marketing department. You need someone who takes direct ownership of pipeline predictability: fixing sales-and-marketing misalignment, building GTM systems that don't depend on constant founder involvement, and increasingly, integrating AI into revenue operations without creating more operational debt than it removes.
The distinction that matters: a fractional CMO is accountable for marketing as a function. A fractional Head of Growth is accountable for the number: pipeline, conversion, revenue impact. It works across sales and marketing to get there, not just within marketing.
How to decide
Ask yourself one question: is your problem "we don't have a marketing department" or "our pipeline is inconsistent and I don't know why"?
- If it's the first, you likely need a fractional CMO (or, if it's genuinely temporary, an interim one).
- If it's the second, you need someone focused on growth outcomes, not marketing management: a fractional Head of Growth, or a strategic advisory engagement that starts with a GTM strategy sprint before committing to an ongoing retainer.
This is exactly the distinction behind the two ways I engage with clients: a Consulting engagement for teams that need the strategic blueprint, and hands-on contractor work for teams that need the pipeline problem solved directly.
Next step
If you're still not sure which model fits, that's a 30-minute conversation, not a guessing game. Request a strategic call and we'll figure out which, if either, makes sense for where you are.