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The zero-age main sequence (ZAMS) is a critical phase for stellar angularmomentum evolution, as stars transition from contraction-dominated spin-up tomagnetic wind-dominated spin-down. We present the first robust observationalconstraints on rotation for FGK stars at $\approx40$ Myr. We have analyzed TESSlight curves for 1410 members of five young open clusters with ages between25-55 Myr: IC 2391, IC 2602, NGC 2451A, NGC 2547, and Collinder 135. In total,we measure 868 rotation periods, including 96 new, high-quality periods forstars around 1 ${M_{\odot}}$. This is an increase of ten times the existingliterature sample at the ZAMS. We then use the $\tau^2$ method to compare ourdata to models for stellar angular momentum evolution. Although the agesderived from these rotation models do not match isochronal ages, we show theseobservations can clearly discriminate between different models for stellar windtorques. Finally, $\tau^2$ fits indicate that magnetic braking and/or internalangular momentum transport significantly impact rotational evolution even onthe pre-main sequence.

Constraining Stellar Rotation at the Zero-Age Main Sequence with TESS