How to survive the first 90 days as a new CMO

This is my dedicated guide that outlines a strategic approach for new Chief Marketing Officers to succeed in their first 90 days. I emphasise the importance of owning your onboarding, building strong relationships with the CFO and C-suite, conducting a thorough, actionable audit, and focusing on quick wins. By shifting from a functional leader to a business executive, new CMOs can establish credibility and drive long-term impact.

Most CMOs who struggle in their first 90 days were set up to struggle before they started. The CEOs, founders and leadership teams I coach keep telling me the same thing: new CMOs take too long to understand how the business works, so they have little impact in or out of the boardroom for six months. CMOs also tend to be let go sooner than their C-suite peers when onboarding is poor. You have to own your onboarding, because HR often won't.

» I have written extensively about this in my newsletter for CMO success

Before Day One AKA day -30

Use your notice period (or if out of work a couple of weeks to onboard yourself).

Most new CMOs I see recieve an onboarding process that is hands-off and transactional, with HR leaving it to the leadership team and the headhunter. So run your own:

1. Write down every concern and question. Rank them, decide who should answer each one, and decide when: before you start, during onboarding or in month one.

2. Research the people around the table. Find out how long each C-suite peer has been there and how they got there. A leadership team that has worked together for years has very different trust dynamics from a newly formed one.

3. Ask for the documents. Get the department plan and OKRs, the annual plan, board minutes (or investor updates at an earlier stage), recent QBRs, the seasonality breakdown and access to the product and tech roadmaps.

4. Meet people early. Book meet-and-greets with your marketing leadership, ask for an informal exec dinner or drinks, and book a deep HR session on past issues and performance problems.

5. Decide whether to call the previous CMO. This one is controversial. You'll hear their version, the company line and how the C-suite really works. Their experience won't be yours, but it gives you useful context.

Days 1–30: Triage, Trust and Guardrails

Spend the first days listening. Run a short listening tour, set up 1-2-1s and importantly skip-levels, and find out how decisions really get made. That last one matters most, because the org chart rarely shows it.

In week one, start the CFO relationship, review the budget and forecast, and look at the last 1–3 years of results. If the COO, CPO or Sales lead have oversized influence get on their calendar.

Start a workstream on "the big problem to solve" straight away.

Every board and CEO hired you to fix something, and your 90-day review has to show you're getting closer to fixing it.

To earn credibility quickly, I recommend three moves in the first 30 days:

1. Cut or fix the bottom 20% of spend. Reallocate it.

2. Agree a shared definition of marketing success with the CEO and CFO for this quarter, in language you both use.

3. Walk into the next board meeting with a cleaner, simpler story.

Also check your team's capacity, remove low-value busywork, and put a practical AI policy in place: enough to protect the business without slowing everyone down.

» If you’d like more in these steps read my modern CMO article and CMO exec presence breakdown,

Weeks 2–4: The Full Audit

Kick off a proper audit covering:

- Channels

- Budget and spend

- Analytics

- Martech

- Audience

- Customer service tickets

Identify your high-value employees and the internal influencers, the people who shape how the company feels about things.

Try to find out what the company and teams are hiding, and which past ideas worked, failed or were never tried.

Build deeper relationships with the CPO and with Sales or Partnerships at this stage, and work out early whether you're in a product-led or sales-led business. Your approach has to fit that.

Days 31–90: Fix The Engine

This phase is about efficiency and integration:

- Data and tooling (to day 60). Check how much you depend on third-party data, shift toward first-party data, cut back the martech stack, and settle on a realistic attribution approach. Research MMM (marketing mix modelling) properly before you commit, because it often confirms what you already knew.

- Cross-functional alignment (to day 90). Run a focused session with Sales (or Product) to fix definitions, handoffs and SLAs.

- An AI story the board can follow. Deliver one or two AI pilots with real outcomes, such as time saved, cost down or revenue up.

- Org design and a hiring plan. Start shaping the team you need, and look for short-term quick wins in channel optimisation.

- A brand health measure next to performance dashboards. Make the dashboards explain what's happening as well as report numbers.

The 90–100 Day Review

Close the first 90 days with a formal review. Show the results you've delivered, the results you expect next, your audit findings with an action plan, and your progress on the big problem. The full marketing strategy, agency review and changes to leadership meetings come in weeks 13–26.

[Citations: https://dannydenhard.com/blog/cmo-success]

How You Behave In The Big Room

Most CMOs I coach are already strong at their craft. They lose the room because they act like a department lead defending a function, when the board wants an executive running the business. In practice, that means a few things:

- Know the numbers every morning. That includes CAC, LTV, ROI and margin. Nobody in the C-suite cares about engagement rates, and a CMO who can't answer a numbers question loses the room immediately.

- Avoid "defend and over-explain mode". Give updates in threes. When you're unsure, write an exec summary. Too many CMOs over-explain, over-communicate and then under-deliver.

- Get peers onside before the meeting. Weekly 1-2-1s with the CFO, COO and CPO bring their objections out in private, so they don't come up in front of the CEO.

- Build your PQ. Political intelligence means knowing how decisions really get made. "I don't play the game" doesn't stop the game from happening around you.

Also be honest with yourself before you say yes.

One of our Marketing Unfiltered pieces tells the story of a CMO who took a role in blockchain with no blockchain experience. They faced a protocol launch, a repositioning, a brand refresh and three more go-to-market launches in the first three months, and they left after six months. If you've been out of work for a while, do extra due diligence on whether you can do the job as well as whether you want it.

The first 30 days come down to three things: map who really makes decisions, agree what marketing success means with the CFO, and name the big problem you were hired to solve. Report against all three at day 90.

Are you about to start a CMO role, or already a few weeks in and needing a reset? Get in touch and we can talk about how you will need support and where CMO coaching can fit here.