  We revisit phase transitions in Twin Higgs (TH) models. We show that strong
first-order phase transitions (FOPTs) can occur provided that appropriate
source of $\mathbb{Z}_2$ symmetry breaking between the twin and Standard Model
(SM) sectors is present. We found FOPTs in two classes of models. First: with
hard $\mathbb{Z}_2$ breaking in the scalar potential allowing for FOPT. Second:
with $\mathbb{Z}_2$ broken by enhanced Yukawa couplings of twin leptons. We
also considered supersymmetric UV completion of the second scenario with light
sleptons. The signal of gravitational waves produced during these phase
transitions is typically small but can be close to the reach of AEDGE and
Einstein Telescope in the case of the FOPT induced by light twin sleptons. Our
results open a way to generate SM baryon asymmetry in TH models.
