Passover: When To Finish Kashering

When kashering an oven or utensils for Passover, you may kasher:
  • By Libun
  Anytime, including on chol ha'moed (but not on Jewish festivals or Shabbat).
  • By Hag'ala
  Until one hour before halachic midday on Passover eve (but b'di'avad it is OK until
  just before sunset of Passover eve).