Iceland, one of the last places on Earth that didn’t have mosquitoes until now, has been determined to have mosquitoes, as reported by several news sources, including The Weather Channel. https://weather.com/news/climate/news/2025-10-21-mosquitoes-found-in-iceland-for-first-time
This shouldn’t be an issue over the next few months, with colder temperatures, but come late spring, and in summer, the bloodsuckers will add a new aspect to visiting Iceland.