Pillar | First 90 Days
Your first three months as a manager
The first 90 days set the pattern your team will read for the rest of your tenure. Letters in this pillar cover the listening tour, the first 1-on-1, the inheritance audit, and the trap of trying to prove yourself before you understand the system.
- What to do in the first 30 days versus what to defer
- How to run the first 1-on-1 without making it weird
- The Month-Two Dip and how to ride it
- When to keep what you inherited and when to change it
Most first-time manager advice reads like it was written by someone who has not been one for fifteen years. These letters are from inside the first year. Specific situations. Specific decisions. No motivational posters.
Why the first 90 days matter disproportionately
The decisions you make in the first three months of a management role shape the next two years more than any equivalent stretch of time that follows. This is partly because the team is calibrating you while you are calibrating the work, so everything you do is being interpreted and generalized. It is partly because the window for making changes before the team assumes the current state is permanent is narrower than most new managers realize. And it is partly because your boss’s opinion of you gets formed in this window, and once formed, it is surprisingly hard to change.
None of this means you should make large changes in the first 90 days. The opposite is true. The first 90 days are for diagnosis, relationship-building, and small wins. Large changes belong in days 90 through 180, after the diagnosis is complete and the relationships are built.
Week one: listen, do not lead
Schedule 30-minute 1-on-1s with every direct report in your first week. Keep them to a single question structure: “What is working well on this team that I should protect? What is broken that I should fix? What do you want me to know about you specifically?” Listen. Take notes. Do not announce changes in the first week, even if you can see what needs changing.
The teams that most new managers inherit have accumulated both problems and hacks, and it takes weeks to tell them apart. Something that looks broken from the outside often turns out to be a workaround for a larger systemic issue. Something that looks fine often turns out to be quietly burning out a senior person. Week-one changes almost always break something the new manager did not know was working.
Week two: understand the work before changing it
By week two you should be able to describe what your team is responsible for in a single paragraph, who the key stakeholders are outside the team, what the top three priorities are for the quarter, and where the team’s time actually goes (which is almost never what the org chart says it should). If you cannot answer these, do not move on to changing things. Do more listening.
Weeks three through six: earn the right to change
By week three or four, you should identify one small win you can deliver that demonstrates what you prioritize and how you operate. Not a large change. A small, visible, unambiguous win. Examples: clearing a long-standing blocker that the team has been frustrated by, defending the team against an unreasonable cross-team ask, shipping a small piece of visibility work that makes the team look good to leadership. The small win buys you the credibility to make a larger change in month two or three.
The specific mistakes first-time managers make in their first 90 days
One: changing too much, too fast. The urge to put your stamp on the team is almost always wrong this early. Resist it.
Two: overcommunicating to compensate for insecurity. Flooding the team with updates, thoughts, or ideas to demonstrate activity. This creates noise, not clarity. Communicate less, but more specifically.
Three: canceling 1-on-1s when overwhelmed. This is the single highest-cost reversible mistake new managers make. The 1-on-1 is the one forum where hard conversations get started before they become crises. Canceling teaches the team the 1-on-1 is negotiable, and the harder conversations never start.
Four: avoiding the first difficult conversation. It is usually sitting on the calendar as a known problem by week three or four. Postponing it past day 90 is the move new managers almost universally regret.
Five: accepting the first direct report’s narrative about other teammates. Every team has internal politics. The first direct reports to establish a relationship with the new manager often use that access to shape the manager’s view of the team in ways that serve them. Do not conclude anything about any team member based on what one other team member tells you until you have formed your own view.
The imposter feelings that peak in month two
Most new managers hit their worst stretch of imposter syndrome somewhere between weeks six and ten. Call it the Month-Two Dip. It is predictable, it is accurate feedback that the job is harder than its description, and it passes within a few weeks of being acknowledged. If you are here, you are on schedule.
The letters linked below cover the specific situations most new managers face during the first 90 days. Read them in order, or jump to the one that matches where you are stuck right now.
LETTERS ON THIS TOPIC
APRIL 24, 2026
Leadership Skills for First-Time Managers: The 10 That Actually Matter
The 10 concrete, practice-able behaviors that separate managers whose teams perform from managers whose teams quietly unravel. Narrow, specific, and skip-able for now on the traits that can wait.
APRIL 24, 2026
How to Manage People: The 7-Part Framework for First-Time Managers
Seven parts of the job, in the order you will need them in your first year. A framework you can return to when the noise of daily management makes the shape of the role hard to see.
APRIL 22, 2026
How to Manage Your Team When Your Boss Micromanages You
A practical guide for new managers with a micromanaging boss. Diagnose the cause, absorb the blast, manage up without looking needy, and decide when to escalate.
APRIL 21, 2026
Your First Difficult Conversation as a New Manager
The conversation you keep rehearsing and keep postponing. How to stop delaying, what to open with, and why your script will not survive the first sentence.
APRIL 17, 2026
How to Manage Someone Older Than You Without Pretending You Are Not Nervous
A practical guide to the flipped power dynamic. How to earn respect without overcompensating and how to lead people who have more experience than you.
APRIL 17, 2026
How to Run Your First 1-on-1 as a New Manager: A Practical Template
A template you can actually use in the next 24 hours. The three questions that matter, the one question to never open with, and what to do when they are silent.
APRIL 17, 2026
The First Time You Feel Like a Fraud as a Manager
The impostor moment that hits every new manager in month two, what the feeling is actually telling you, and how to keep showing up while it passes.
APRIL 15, 2026
Five Ways New Managers Sabotage Their Own Teams
The avoidance of hard feedback is one of them. The other four are the moves new managers make to feel safe that quietly burn down the team.
THE WEEKLY
If you want more writing like this, the Tuesday letter goes out every week.
Questions new managers ask
First 90 days and first 1-on-1s, the FAQ
What should I cover in my first 1-on-1 with a direct report
Three things in 30 minutes. What’s working for them right now and what isn’t. How they like to be managed (specifics, not platitudes). What you should know about them as a person without crossing into territory that’s not yours to ask about.
The trap most new managers fall into is treating the first 1-on-1 as a chance to set expectations. Don’t. You haven’t earned the standing to set expectations yet. The first 1-on-1 is about gathering information. The expectation-setting conversation is week three or four, after you’ve built any trust at all.
How often should 1-on-1s happen
Weekly is the default. Biweekly is acceptable for senior reports who have a low surface area of questions. Monthly is too rare unless the report is genuinely independent and has a lot of other communication channels with you.
Length: 30 minutes weekly works for most. 45-60 is fine if there’s substance. The mistake is treating cadence as a policy and refusing to flex it. If someone needs three 1-on-1s in a week during a hard moment, give them three.
Who should own the 1-on-1 agenda, me or my report
They should. Your report owns the agenda. You bring two or three things you need to discuss as appendix items, but the meeting is theirs by default. This sounds small. It is not. The agenda ownership is the actual signal about whether a 1-on-1 is for them or for you.
A shared Google Doc or Notion page where they jot items between meetings is enough. Don’t make them prepare a deck. Don’t grade their preparation. The point is the conversation, not the artifact.
What’s the right first 90-day plan for a new manager
Days 1-30: listen and learn. Don’t change anything you don’t have to. Run the first 1-on-1 with each report. Read the documentation that exists. Sit in on the meetings other managers attend. Note what’s broken without trying to fix it yet.
Days 31-60: name the patterns you’ve seen. Quietly raise the smallest ones with the team. Pick one specific friction point everybody mentioned and fix it visibly. Build a working theory of what the team needs from you.
Days 61-90: start making the larger changes the previous 60 days earned you the standing to make. By day 90 your team should know what you stand for, what you’ll protect them from, and what you expect of them. Anything bigger than that is for the next 90.
Should I ask about personal life in 1-on-1s
Ask about how the work is going outside the work, not about the personal life directly. “How are things outside of here” gives them the opening if they want it. “How is your family” puts them in a corner if their family situation is complicated.
The reports who want to share will share. The reports who don’t shouldn’t be pushed. Some of the best manager-direct-report relationships have approximately zero personal content. Don’t perform closeness. Be reliable instead.
What if my direct report doesn’t talk in 1-on-1s
First, sit longer in silence than feels comfortable. Most new managers fill silence too fast. Many introverts need an extra five to ten seconds to start. Wait them out.
Second, switch to written prep. Ask them to send three bullets the night before. People who don’t talk often write fine. The format is the issue, not the willingness. Third, ask better questions. “How’s it going” gets a one-word answer. “What’s the one thing you’ve been thinking about most this week” gets a real one. The question quality drives the conversation quality.
When should I have my first hard conversation with a report
Sooner than you want to. Most new managers wait three to four months for an issue that should have been raised in week two. The longer you wait, the more the report assumes the behavior is acceptable, and the harder the conversation gets when you eventually have it.
The default rule: if you’ve noticed it twice, mention it casually. If you’ve noticed it three times, raise it formally in a 1-on-1. Don’t wait for a fourth. The “let me see if this is a pattern” framing is usually a delay tactic dressed up as fairness.
What’s the biggest mistake first-time managers make in their first 90 days
Trying to be liked. The best first-90-days managers are not the warmest ones. They’re the most predictable ones. Your reports want to know what you’ll do, not whether you like them. Predictability is the foundation of trust. Warmth, if it happens, comes later.
The second biggest mistake is changing too much too fast. The team you inherited has a working memory of what doesn’t work. They will tell you in week one. If you fix everything they mention, you’ve signaled that volume of complaint determines priority. Pick the one or two things that are clearly broken and ignore the rest until you’ve earned the read.