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We use three campaigns of K2 observations to complete the census of rotationin low-mass members of the benchmark, $\approx$670-Myr-old open clusterPraesepe. We measure new rotation periods (\prot) for 220 $\lesssim$1.3~\Msun\Praesepe members and recover periods for $97\%$ (793/812) of the stars with a\prot\ in the literature. Of the 19 stars for which we do not recover a \prot,17 were not observed by K2. As K2's three Praesepe campaigns took place overthe course of three years, we test the stability of our measured \prot\ forstars observed in more than one campaign. We measure \prot\ consistent towithin $10\%$ for $>95\%$ of the 331 likely single stars with $\geq$2high-quality observations; the median difference in \prot\ is $0.3\%$, with astandard deviation of $2\%$. Nearly all of the exceptions are stars withdiscrepant \prot\ measurements in Campaign 18, K2's last, which wassignificantly shorter than the earlier two ($\approx$50~d rather than$\approx$75~d). This suggests that, despite the evident morphological evolutionwe observe in the light curves of $38\%$ of the stars, \prot\ measurements forlow-mass stars in Praesepe are stable on timescales of several years. A \prot\can therefore be taken to be representative even if measured only once.

Three K2 Campaigns Yield Rotation Periods for 1013 Stars in Praesepe