They've sprouted about three weeks ago and are outside fulltime for about a week now. The first week I only dared to put them outside during the day.
With the mild temps around 12-22°C during the day and 5-8°C at night I tried to leave them outside 27/7, though under the protection of my mini greenhouse ofcourse. Coming 2 days will have night temps around 2° though so hope by now they're hardened off to get through it. If not, another lesson learned I guess