PORTLAND, Maine (AP)   It’s so cold out there that even brave swimmers who a take a plunge this time a year are thinking twice.

Frigid dips in Maine and Massachusetts have been cancelled or rescheduled. Scores of other polar swims will go on as scheduled including the famous L Street Brownies New Year’s Day plunge into Boston Harbor.

The annual Lobster Dip at Old Orchard Beach in Maine on New Year’s Day has been rescheduled for the first time in 30 years. The event, which raises money for Special Olympics of Maine, will now be held Jan. 13. Organizers said they were concerned about the safety of the swimmers.

The Providence Journal reports that a polar plunge scheduled for New Year’s Day to benefit an animal shelter in Falls River, Massachusetts was cancelled.