Till Mar 24, 2016: open at any reasonable time during daylight hours
Usual facilities may not be available around the Summer Solstice (Jun 20-22).
Strictly no access to the hill itself.
Admission to the site is free.
English Heritage website https://www.english-heritage.org.uk/daysout/properties/silbury-hill/
Phone +44 870 333 1181
Address West Kennett, Marlborough SN8 1QH, UK
Coordinates 51°24'56.688" N -1°51'26.62" E