The outdoor min/max temperature for seedlings

What (1) phase you are in and (2) the specific genetics of the strain and (3) the type of medium all come into play. Seedlings are temperamental and vulnerable, vegetative adult plants can take a beating, and flowering plants are somewhere in-between with temps. The genetics comes into play for example, is this genetic display something of a parent or grandparent that is naturalized in Alaska or the rainforest? Lastly, something that is being researched now, is medium in this area. Essentially what the research is showing is that the root zone health and temperature is much more important than foliage temperature. A healthy living soil web and a robustly thriving root zone has shown capabilties such as withstanding 100F+ days (recall this from a Dr. Bugbee video a while back).