Parents are outraged after more than 30 girls from a Kenyan boarding school had to spend cold night out in a field.

The girls, who attend Nasokol Secondary in West Pokot, were allegedly thrown out by their headmistress for poor grades, according to local reports.

Many of the girls are on a football scholarship programme which had previously taken a relaxed approach to the payment of school fees and academic performance, the Kenyan Daily Nation reports.

But the school's new principal has allegedly taken issue with the poor results of some girls and scrapped her predecessor's policy, causing the group of 15 to 17 year-old girls to be thrown out of school on Monday evening.