Trick-or-treating won’t be for everyone this Halloween. For many school districts, inclement weather from rain and snow could make walking outside problematic, which means those trick-or-treaters who feel they don’t need to walk, are likely being directed to stay at home. While the National Weather Service tells parents and students it is unlikely school districts will cancel trick-or-treating and the door-to-door festivities will go on, students and parents are taking extra precautions.
Trick-or-treating will be canceled in schools where we don’t have reliable air quality. — School District of Philadelphia (@PhillyDPS) October 27, 2015
Of course, trick-or-treating could be canceled because of bad weather, but that is not as likely a scenario in many of the United States. In other places, though, the decision to close trick-or-treating — or not open the doors at all — is made by families. The Philadelphia school district went so far as to say that trick-or-treating would be canceled at schools that could not guarantee the safe use of the air at the end of the day. The decision comes in the wake of an aggressive by-product of winter-related snows called “polar vortex,” which has some scientists warning about the health and physical impact of the weather on children. The following states, which have schools closing trick-or-treating for Halloween this year, are among the ones where parents are being urged to do their part to keep the children safe by attending an event and/or keeping children home: Alaska, Arizona, Colorado, Hawaii, Louisiana, Michigan, Minnesota, New York, North Carolina, Ohio, South Carolina, Texas, Virginia, Wisconsin, Washington, Illinois, Kentucky, Montana, and Oregon.
Many school districts are announcing trick-or-treating cancellations for this year #mostate — Illinois Public Education Network (@ipe_dnr) October 31, 2018
Since parents can’t control weather and can’t make it possible for them to play trick-or-treating in the rain or snow, they are being encouraged to stay home. Colorado Springs, Colorado, has canceled trick-or-treating for students as well as giving parents information to let children know there is no need to participate. Those wishing to celebrate Halloween in spite of the weather can opt to stay home in their own city, though they can be fined if found out.
In case you need reminders for this year, our social media platform is full of activities and events that you can participate in this Halloween. https://t.co/SuQCpDmVLX pic.twitter.com/h4wK6UlK5J — Family.Me (@FamilyMeApp) October 21, 2018
In Colorado, where a full circle of winters is expected to return, trick-or-treating may not be the least fun thing to do this Halloween night. In Evanston, Illinois, parents are urged to stay home if they have not organized a trick-or-treating party. The community agency organizers are also advising parents to make sure their children’s costumes are fit for the rain. A pair of examples of outfits appropriate for rain could be ones that have bonnets, raincoats, rain pants, and rain boots, and don’t have any debris on the headband or no part of the costume touching the ground. The school in Benton Harbor, Michigan, where the rain showers are expected throughout the night, will be hosting an outdoor Halloween celebration.
This article originally appeared on Fortune.com.