Due to the COVID-19 pandemic special restrictions are in place.
: The green-border is closed until further notice, likely for the rest of the year. You're not allowed to cross in and out of Kosovo other than at official border controls. Because of this the option to apply for crossing from/into Kosovo is not available on the form.
Does only allow entry for citizens from "green listed" countries AND only as long as they have not traveled to countries outside the green list for the last 15 days.
As per last update Albania and Kosovo are on the "yellow list". If you visited these countries in the last 15 days, a negative COVID-19 test, no older than 72 hours, is required to enter Montenegro.
The lists are updated weekly but are only published in Serbian, use Google Translate. Due to the updates, you may be eligible at the time of application, but not be allowed to enter later on. All countries not on the list are considered "red" and prohibited from entering.
: No restrictions apply.
Beware that on top of the above, your home country may require you to enter quarantine upon return. Often a recent negative COVID-19 test can override this. Quick tests with 3-4 hours waiting time are available at major airports, for example in Vienna, at a price range from €150-200.
Note that border controls are intensified as locals are trying to cross illegally. By crossing illegally you may not only break immigration, but also specific COVID-19 laws.