The honest answer is: it depends on three things your contract probably doesn't address clearly — geographic radius, duration, and whether the clause survives a court's reasonableness test in your state.
California will void it entirely. Florida will enforce it almost automatically. Every other state lives somewhere in the messy middle, and that middle changes with every legislative session. The contract your attorney drafted in 2018 may have been overtaken by a 2023 state amendment you never heard about.
The more pressing issue is what "across the street" actually means to your practice. If your associate built a client following in a specific specialty — exotic animals, oncology, dentistry — the economic harm isn't geographic. It's relational. Courts are increasingly sophisticated about this distinction, and your non-compete language probably isn't.
What actually holds up: a narrowly drawn covenant tied to clients they personally treated, combined with a non-solicitation provision that has teeth. Broad geographic bans over 5 miles rarely survive challenge. A 12-month client non-solicitation with a clear liquidated damages clause usually does.
A three-vet practice in suburban Ohio discovered their associate had been quietly building a client list for 18 months before resigning. The non-compete was geographically broad but had no client-specific language. The practice recovered nothing. A revised structure for their next hire included tiered non-solicitation with a $45,000 liquidated damages provision — and it was never challenged, because the associate knew it would hold.
Associate Non-Compete Audit Checklist
Review your existing agreements against current enforceability standards in your state. Includes clause-by-clause analysis template and the 7 provisions courts most frequently void.