The threshold stress intensity factor for delayed hydride cracking (DHC; KIH), the rate of stable crack growth (VDHC), and their temperature dependences were determined for unirradiated fuel cladding tubes in comparable metallurgical states made of three alloys representing different alloying systems of zirconium: Zircaloy-4, E635M, and E110opt. The temperature dependences of KIH and VDHC have the same behavior for all alloys but are quantitatively different. VDHC and its temperature dependence decrease for the alloys in the above sequence, whereas KIH increases at minimum values of 5, 6.7, and 11.5 MPa√m, respectively, for Zircaloy-4, E635M, and E110opt. The maximum temperature, above which there is a deviation of VDHC from the Arrhenius behavior with a sharp decrease in it and a concomitant increase in KIH, is 292, 280, and 231°C for Zircaloy-4, E635M, and E110opt, respectively. The obtained results, including an analysis of striations in the fractography of hydride cracks, indicate an increase in the resistance to DHC of the alloys in the order Zircaloy-4, E635M, and E110opt, with the obvious superiority of the latter.