When Is Samhain 2025. Samhain marks the end of the harvest season and the beginning of winter or the “darker half” of. It marks a major turning point in the year and is traditionally observed.
More specifically, samhain celebrations begin at sunset on october 31st and end at sunset of november 1st. Samhain, imbolc, beltane and lammas, fall on dates that represent high energy in the season.