Location almanac
Chill hours in R1B
The short answer
R1B averages 875 chill hours per winter (581–1,260 across 10 years) in USDA zone 4a.
Climate profile
| Average chill hours | 875 (581–1,260 across 10 winters) |
|---|---|
| USDA hardiness zone | 4a (NRCan zone 3b) |
| Last spring frost | typically May 1 – May 22 |
| First fall frost | typically October 3 – October 16 |
Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.
What grows here
Every variety in our database, checked against R1B’s chill hours and zone:
Good fit (117)
Chill and zone requirements are comfortably met in R1B.
| Variety | Fruit |
|---|---|
| Acey Mac | Apple |
| Akane | Apple |
| Arkansas Black | Apple |
| Chestnut Crab | Apple |
| Cortland | Apple |
| Cox's Orange Pippin | Apple |
| CrimsonCrisp | Apple |
| Earligold | Apple |
| Empire | Apple |
| First Kiss | Apple |
| Frostbite | Apple |
| Fuji | Apple |
| Gala | Apple |
| Ginger Gold | Apple |
| GoldRush | Apple |
| Golden Delicious | Apple |
| Golden Supreme | Apple |
| Gravenstein | Apple |
| Haralson | Apple |
| Honeycrisp | Apple |
| Honeygold | Apple |
| Idared | Apple |
| Jonagold | Apple |
| Jonamac | Apple |
| Jonathan | Apple |
| Liberty | Apple |
| Lodi | Apple |
| Northern Spy | Apple |
| Paula Red | Apple |
| Prima | Apple |
Show 87 more good fit varieties
- Red Delicious
- SnowSweet
- Spartan
- Suncrisp
- Sweet Sixteen
- Topaz
- TropicSweet
- Wealthy
- Yellow Transparent
- Zestar
- Goldcot
- Harcot
- Moongold
- Sungold
- Tomcot
- Arctic Star
- Double Delight
- Fantasia
- Flavortop
- Harko
- Independence
- Mericrest
- Panamint
- Snow Queen
- August Pride
- Babcock
- Belle of Georgia
- Donut
- Elberta
- Eva's Pride
- Flameprince
- Flordacrest
- Flordaprince
- Frost
- Gulfprince
- Harvester
- Junegold
- Loring
- Mid-Pride
- O'Henry
- Redglobe
- Redskin
- Suncrest
- Tropic Snow
- TropicBeauty
- UFGold
- UFOne
- UFSun
- 20th Century
- Chojuro
- D'Anjou
- Harrow Delight
- Kieffer
- Luscious
- Moonglow
- Parker
- Patten
- Shinko
- Summercrisp
- Warren
- Yoinashi
- Hachiya
- Alderman
- Beauty
- Blue Damson
- Elephant Heart
- Flavor Grenade
- Flavor King
- Flavor Supreme
- French Improved Prune
- Green Gage
- Italian Prune
- Santa Rosa
- Satsuma
- Stanley
- Superior
- Brooks
- Craig's Crimson
- Sunburst
- Van
- Balaton
- Early Richmond
- English Morello
- Evans Bali
- Meteor
- Montmorency
- North Star
Marginal (3)
Possible in a good year or a favorable microclimate — click through for the caveats.
| Variety | Fruit |
|---|---|
| Contender | Peach |
| Cresthaven | Peach |
| Reliance | Peach |
Plan the year in zone 4
Questions
- How many chill hours does R1B get?
- R1B averages 875 chill hours per winter, ranging from 581 to 1260 across the last 10 years.
- What hardiness zone is R1B?
- R1B is in USDA hardiness zone 4a.
Growing fruit trees in R1B? Get a care calendar anchored to this exact climate, with email reminders.
Start My OrchardSources
- [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
- [2] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026