Cold hardy pears revisited in 2025 for zone 1 , 2, 3, 4

I dont know a lot about frost yet Frost pear

@marknmt anything to add yet?
"This selection was discovered on an old ranch in Montana’s Bitterroot Valley. The old veteran was planted nearly 100 years ago and continues to win the “Blue Ribbon” at our county fair. The canopy is upright, vigorous and disease resistant. The fruit ripens in late September and is quite large, similar to Bartlett in size and shape, with sweet, juicy melting flesh. We are still trying to identify this variety and assigned the ranch name “Frost” with this treasure until positive ID is established. A favorite here and recommended for Western Montana.”
pear bartlett

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