The northbound stretch of the motorway between J37 and J38 was shut at around 9.40pm to allow vehicles to be recovered and for accident investigators to carry out investigations.
A spokesman for Cumbria Fire and Rescue Service said:
Nobody was trapped in their vehicles, so fire crews assisted the ambulance service with casualty care and first aid."
The road is now re-opened but police are urging motorists to take extra care while a weather warning remains in place until 11am Sunday due to predictions of wintry showers and ice.
More top news
On the first day of the meteorological Autumn - what will the weather have in store?
The First Minister will introduce standardised tests in primary schools, and a number of other bills in the next Parliament session.
Vern Cotter has announced the Scotland squad for the 2015 Rugby World Cup, and three players from the Scottish Borders are included.