When should we start hatching eggs (In NH)

Good Morning! I am in Southwestern NH and we've only had our chickens for about a year. We did a late hatch in August using a hen and only had one chick hatch. My husband and I want to try again this year, but earlier, we're just not sure when it's ok to start letting a hen lay on the eggs in our area. Is there a temperature at night that we should wait for, or will the eggs be ok? Being in New England there's always a possibility of snow into April. Do I need to wait for the weather to be nicer?

Thanks!!

Elysia

 

Thanks! We're having issues with the hens eating the eggs before we get them each morning, so if we can cut them of that habit then I think we'll see if we can get some hatched in the next few months.