The First 90 Days: A Field Guide for New Public Sector Supervisors

Three months into her first supervisory role, a public works manager I worked with told me she was working harder than she ever had and still felt like she was failing at all of it. She was doing her old job, the one she had been promoted out of, because it was familiar and she was good at it. The new job, the one she had actually been hired to do, kept getting pushed to the end of the day, then to tomorrow, then to never. She is not unusual. She is the norm.

Why the First 90 Days Matter More Than You Think

In government, we promote people for being excellent at the technical work. The best plan reviewer becomes the planning supervisor. The sharpest firefighter becomes the company officer. The most reliable accountant becomes the finance manager. It makes sense, and it is also where the trouble begins. Technical excellence and leadership are different skills, and the first 90 days are when your team quietly decides which one they are getting. People form their impression of a new supervisor fast, and that early impression is sticky. The window to set the tone is short, and it does not reopen easily.

Stop Doing Your Old Job

The single most common mistake new supervisors make is refusing to let go of the work that made them successful. It feels productive. It is familiar, it is measurable, and it gives you a sense of control on days when leading people feels like anything but. The problem is that every hour you spend doing your old job is an hour you are not doing your new one, and your team notices. They did not need you to out-perform them. They needed you to clear the road, set the direction, and back them up. Letting go is not abandoning quality. It is trusting the people you were put in charge of leading.

Set Expectations Before You Need Them

Most accountability problems are expectation problems in disguise. New supervisors often wait until something goes wrong to clarify what they want, and by then the conversation feels like a reprimand instead of a reset. Set expectations early, while the slate is clean. Be specific about what good work looks like, how you want to communicate, and what you will and will not get involved in. Clear expectations are a gift, not a constraint. They tell your team how to succeed with you before anyone has a chance to fail.

Have the Conversation Everyone Avoids

There is one conversation almost every new supervisor skips, and it quietly costs them. It is the direct, honest, one-on-one with each member of the team early in the transition. Not a status update, a real conversation about what they need from you, what is working, what is not, and what they are worried about now that the chairs have moved. If you were promoted over former peers, this conversation is even more important and even more uncomfortable, which is exactly why it matters. Avoiding it does not make the awkwardness disappear. It just lets the awkwardness set.

Build Trust Before You Spend It

Authority comes with the title. Trust does not. In the first 90 days you are making small, constant deposits into an account you will need to draw on later, when you have to make an unpopular call, deliver hard feedback, or ask the team to do more with less. You build that account by doing what you said you would do, by being consistent, and by protecting your people when it counts. Leaders who try to spend trust they have not earned find the account empty at the worst possible moment.

None of this is intuitive, and none of it is taught in the technical training that got you promoted. The good news is that it is learnable, and the first 90 days are the best time to learn it. The supervisors who thrive are not the ones who had it figured out on day one. They are the ones who recognized that the job had changed and were willing to change with it.

If you are stepping into a new leadership role and want a thinking partner who understands the public sector, that is the kind of work I do.

Schedule a Call

To go deeper on leading well in a new role, listen to The Leadership Shift podcast episode "Why Capable Managers Struggle After Promotion"