I am located in west-central Montana, in the Missouri River Valley,at 4,000 feet elevation just north of Helena , Montana. We are in zone 4b,and based on the last two winters and this totally insane February of 2019, zone 4b is dead on. Getting enough chill hours is not a problem here but late frosts can be. We have experienced as little as 6-7 total inches of precipitation in a year to around 14 inches last year. Three of the last seven winters have seen very little snow cover, the last two winters have had 90 to 110 consecutive days of snow cover, and this one had virtually no snow cover until mid January and now we are buried as deeply as 20inches (45-50 cm) of snow and most nights below 0 F. We clearly have a great deal of climatic variability.
We are growing about 10 cultivars of apples: Sentinel apples-varieties red, golden, and North Pole, dwarf honey crisp, yellow transparent, Carol, wealthy, liberty, sweet 16, and a few others I can't think of at the moment.
I have had decent success with the "prairie cherries"developed at the University of Saskatchewan: Evans (Bali) Romeo, and carmine jewel bush cherries so far with Juliet on order for this spring (assuming we have Spring). Local nurseries sell the Juliets and say they do well and I see no reason why they won't. I do have one. Traditional pie cherry- montmorency. The oldest Evans came into production last summer and have thrived in spite of abuse their first couple of years in the ground ( deer browsing and psychotic late winter warm spells followed by Arctic freezes causing die-back)
Pears include Summercrisp, gourmet, Ely,Patten and a few others. The Summercrisp, Ely and gourmet have thrived and the others have poked along the last four years.
plums- the prune types have done well and started producing well after three years in the ground. They are tough as nails in terms of putting up with wicked north winds and poor original soil. The cultivars ar Stanley, Santa Rosa, and Italian prune. I have surrounded these specimens with Bocking 14 comfrey and these plants have done wonders to suppress grass and provide mulching fodder.
I am growing hybrid plums as well. Six varieties all in the ground two years and still establishing. I lost the black ice cultivar to who knows what. Survivors with hope for good growth include: superior, Alderman, Waneta, and three others .
Enough of my rambling. Would gladly discuss other fruiting plants later.