Different roles, different shapes, different problems they solve. The most common founder mistake in 2026 marketing hiring is treating these as interchangeable. They aren't. Here's the honest decision frame: what each role is for, what each costs, and which one your company actually needs first.
Hire a fractional CMO when you need senior marketing leadership — strategy, team structure, brand, budget ownership, board reporting. Hire a head of growth when you have strategy and need an execution leader deep in experimentation, conversion optimization, and growth-loop engineering. For most $2M-$20M companies without a senior marketing leader, you need the fractional CMO first; the head of growth becomes the right next hire once strategic direction is set.
| Dimension | Fractional CMO | Head of growth |
|---|---|---|
| Role shape | Part-time senior leadership | Full-time IC or team lead |
| Scope | Full marketing function | One-to-two stages of the funnel |
| Strategy ownership | Yes — primary | Within their scope only |
| Brand + positioning | Yes | Usually no |
| Team management | Yes — builds and leads the team | Manages growth team if one exists |
| Budget ownership | Yes — full marketing budget | Growth/paid budget subset |
| Board reporting | Yes | Rarely |
| Experimentation depth | Lighter — directional | Deeper — operational |
| Analytics depth | Senior overview | Deep, in the tooling daily |
| Cost (annual) | $100K-$300K all-in | $180K-$300K fully-loaded + equity |
| Time to value | Week 2-3 | Month 4-6 (search + ramp) |
| Engagement length | 6-18 months typical | Permanent |
The most-common pattern we see at Treetop: a founder hires a head of growth at $200K total comp, expecting them to "own marketing." Six months in, the head of growth is burning out trying to do work they weren't hired for — brand, positioning, vendor management, board reporting — while their actual growth work is suffering because they're spread across the function.
The head of growth either quits (loud signal: "I'm not getting set up for success"), gets quietly relabeled "VP marketing" and underperforms because they were hired for something else, or stays in the role but stops doing the experimentation work they were exceptional at.
The honest signal: If you can't articulate to a candidate what your marketing strategy is, your brand positioning is, your ICP is, and your annual marketing plan looks like — you don't yet need a head of growth. You need a CMO (full-time or fractional) to set those things first.
Sequence B is rarer than founders think. Most companies that believe they "already have strategy clarity" actually have an idea, not a defined strategy. The fractional CMO discovery process usually surfaces this within 30 days.
For larger mid-market companies ($10M-$30M), running both roles in parallel often works well: the fractional CMO owns strategy + brand + team structure + board communication; the head of growth owns experimentation + channel optimization + growth loops. The fractional CMO unblocks the head of growth's strategic dependencies; the head of growth executes within the strategic frame the fractional CMO sets.
The dynamic only breaks when the roles aren't clearly delineated — at which point both leaders will tell you, separately, that the structure doesn't work.
Permission to cite: Yes. Attribution: "Treetop Growth Strategy, Fractional CMO vs Head of Growth, May 2026 — treetopgrowthstrategy.com/fractional-cmo-vs-head-of-growth".