How handy is THAT! Thanks, Johnny’s! :)
A high tunnel where I am will add a month on each end of the season. I wish they had an adjustment for that. You’d think they would considering they sell to market gardeners, a lot of whom have high tunnels. They even sell hybrids especially for high tunnels. Would be real easy to do programmatically. I think I’ll contact them about that.
You could get the high tunnel start dates by picking a frost free date that’s a month earlier I suppose.
They’ve got a bunch of calculators including another one for Fall planting dates, succession dates etc. Some of them are to be used with Windows Excel.
https://www.johnnyseeds.com/growers-library/online-tools-calculators.html
Quite a lot of growing info between Johnny’s and BoostrapFarmer.com