Many neopagans in the Northern Hemisphere recognize the following Sabbats:
Samhain - New Year - the start of the Pagan year, on or near October 31 or November 1 or when the sun reaches 15 degrees Scorpio
Yule - Winter Solstice - occurs when the sun reaches its southernmost point, between December 20 and December 23
Imbolc (also know as Oimelc, Brigid, or Candlemas) - February 1 or 2 or when the sun reaches 15 degrees Aquarius
Ostara - Vernal or Spring Equinox - when the sun crosses the equator moving northward, occurs March 20-23
Beltane - May 1 or when the sun reaches 15 degrees Taurus
Midsummer or Litha - Summer Solstice - when the sun reaches its northernmost point, June 20-23
Lammas - August 1 or when the sun reaches 15 degrees Leo
Mabon - Autumnal Equinox - when the sun crosses the equator moving southward, September 20-23