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Fruit trees require a period of dormancy and an accumulation of chilling to produce flowers and fruit.

The chilling requirement is the total number of hours required during the winter for a particular cultivar to induce the tree to break dormancy and produce flowers. A tree with low chill hours may grow in the colder regions but it may bloom too early in the season, because its chilling requirement has been met with just a few cold fronts and later freezes may damage flowers or fruit. It is very important to know what chilling hours you receive to make sure you plant the correct varieties for your location.

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Calender Schedule
American Elderberry Hours Bloom Origin Weather Pollination
Ranch University Of Missouri
Apple Hours Bloom Origin Weather Pollination
Ariane Angers, France
Arkansas Black Flowering Group 3
Ashmeads Kernel Mid - Late Flowering Group 4
Aurora Golden Gala Summerland, British Columbia 23° F | 83° F | 1.4 in
Bakers Delight Flowering Group 2
Belle de Boskoop Flowering Group 3
Blenheim Orange Flowering Group 4
Blue Pearmain Flowering Group 3
Braeburn Mid Flowering Group 5
Bramleys Seedling Flowering Group 3
Brownlees Russet Flowering Group 3
Bulmers Norman Flowering Group 3
Chivers Delight Flowering Group 4
Claygate Pearmain Flowering Group 4
Cornish Aromatic Flowering Group 4
Court Pendu Plat Flowering Group 6
Coxs Orange Pippin Flowering Group 3
Crimson Crisp Rutgers University, New Jersey
Dabinett Flowering Group 6
Dalitron Angers, France
DArcy Spice Flowering Group 4
Discovery Flowering Group 3
Duchess Of Oldenberg Flowering Group 2
Early Harvest Flowering Group 1
Eden Agriculture & Agri-Food Canada
Egremont Russet Flowering Group 2
Empire Flowering Group 4
Fall Pippin Flowering Group 4
Fiesta Flowering Group 4
Freedom Flowering Group 3
Fuji 200 - 400 Mid Flowering Group 3
Gala 500 Mid - Late Flowering Group 4
Galarina Angers, France
Gloria Mundi Flowering Group 4
Golden Delicious Late - Mid Flowering Group 4
Golden Russet Mid Flowering Group 3
Goldrush Mid - Late Flowering Group 4
Granny Smith 400 Mid Flowering Group 3
Gravenstein Flowering Group 1
Gravenstein Washington Red Wenatchee, Washington 25° F | 88° F | 1.5 in
Greensleeves Flowering Group 3
Herrings Pippin Flowering Group 5
Holstein Flowering Group 3
Honeycrisp Flowering Group 4
Howgate Wonder Flowering Group 4
Hudsons Golden Gem Flowering Group 3
Jazz New Zealand
Jonagold Mid - Late Flowering Group 3
Jonathan Mid - Late Flowering Group 3
Juliet Rutgers University, New Jersey
Karmijn de Sonnaville Flowering Group 4
King Of Tompkins County Flowering Group 3
Kingston Black Flowering Group 5
Liberty Flowering Group 3
Lynn Rock Island, Washington
MacExcel Agriculture & Agri-Food Canada
MC38 Harcourt, Australia
Monark Flowering Group 4
Mother Flowering Group 4
Mutsu Flowering Group 3
Nicola Summerland, British Columbia 23° F | 83° F | 1.4 in
Northern Spy Flowering Group 5
Opal Czech Republic
Orleans Reinette Flowering Group 4
Pink Lady 200 - 400 Flowering Group 3
Pinova Flowering Group 4
Pixie Flowering Group 4
Pixie Crunch Rutgers University, New Jersey
Rebella Dresden, Pillnitz, Germany
Red Astrachan Flowering Group 1
Red Devil Flowering Group 4
Reinette Russet Angers, France
Ross Nonpareil Flowering Group 2
Roxbury Russet Flowering Group 4
Rubens Ferrara, Italy Flowering Group 3
Rubinette Flowering Group 3
SJ 303 Thompsons Brook, Western Australia
St Edmunds Pippin Flowering Group 3
Stella Minnesota Cleveland, Minnesota
Sundance Rutgers University, New Jersey
Sunset Flowering Group 3
Suntan Flowering Group 5
Sweet Sixteen Flowering Group 3
Trembletts Bitter Flowering Group 5
UEB 3375/2 Czech Republic
Wealthy Flowering Group 3
Winesap Mid - Late Flowering Group 3
Yellow Newton Flowering Group 4
Yellow Transparent Flowering Group 2
Apricot Hours Bloom Origin Weather Pollination
Kettleman Parlier, California
Suaprinine Wasco, California
Suapriten Wasco, California
Sugar Pearls 04 - 05 Harlayne, Jerseycot
Asian Pear Hours Bloom Origin Weather Pollination
20th Century Nijisseiki 300-400 Early-Mid Season Self, Shinseiki, Bartlett
Hosui 300-400 Early-Mid Season Shinko, Chojuro, Bartlett, 20th Century
Kikusui 500 Mid Season Ishiiwase, 20th Century
New Century Shinseiki 250-300 Mid Season
Shinko 450 Early-Mid Season Hosui, Chojuro, Kikusui, Bartlett
Shinsui 400 Needs Partner
Ya Li 300 Tsu Li
Dwarf Sour Cherry Hours Bloom Origin Weather Pollination
Carmine Jewel East Lansing, Michigan 17° F | 82° F | 3.6 in Self
Juliet Self
Romeo Self
European Pear Hours Bloom Origin Weather Pollination
Bartlett 500-600 Late-Mid Season Bosc, DAnjou, Winter Nelis
Beurre Bosc Needs Partner
Conference Flowering Group 3
Doyenne Du Comice Flowering Group 3
Hendre Huffcap Flowering Group 3
Hood 100-200 Very Early Flordahome
Moonglow 400-500 Mid Season Needs Partner
Seckel 500 Mid-Late Season Self
Shenandoah Kearneysville, West Virginia
European Plum Hours Bloom Origin Weather Pollination
Orablue Kearneysville, West Virginia
Stanley Very Late Self
Valerie Vineland, Ontario, Canada
Vandor Vineland, Ontario, Canada
Vanette Vineland, Ontario, Canada
Vibrant Vineland, Ontario, Canada
Violette Vineland, Ontario, Canada
Japanese Plum Hours Bloom Origin Weather Pollination
Vampire Vineland, Ontario, Canada
Nectarine Hours Bloom Origin Weather Pollination
Amber Fire Modesto, California
Andes Nec-3 Paine, Chile
August Bright Le Grand, California
Autumn Blaze Modesto, California
Autumn Pearl Le Grand, California
Bright Sweet Le Grand, California
Burnecteleven Fowler, California
Burnectfive Fowler, California
Burnectfour Fowler, California
Burnecthree Fowler, California
Burnectone Fowler, California
Burnectseven Fowler, California
Burnectseventeen Fowler, California
Burnectsix Fowler, California
Burnectsixteen Fowler, California
Burnectten Fowler, California
Burnectthirteen Fowler, California
Burnectthirty Oakdale, California
Burnecttwelve Fowler, California
Burnecttwentyfive Oakdale, California
Burnecttwentyseven Oakdale, California
Burnecttwentysix Oakdale, California
Burnectwo Fowler, California
Cakedelice Elne, France
Coelho Riverdale, California
Hahong Suwon, Republic Of Korea
Honey Diva Modesto, California
Honey Fire Modesto, California
Honey Haven Modesto, California
Honey Spring Modesto, California
Honeylicious Modesto, California
Late Pearl Le Grand, California
Mericrest Mid-Late Season Self
Nectabingo Elne, France
Nectadiva Elne, France
Nectafest Kearneysville, West Virginia
Nectasia Elne, France
Pearlicious XVI Le Grand, California
Pearlicious XVII Le Grand, California
Pearlicious XXII Le Grand, California
Pearlicious XXIII Le Grand, California
PF 11 Coloma, Michigan
Plablanec Cartaya, Huelva, Spain
Platornec Cartaya, Huelva, Spain
Polar Sweet Modesto, California
R82358 Dinuba, California
Rose Bright Le Grand, California
Royal Bright Le Grand, California
Sierra Pearl Le Grand, California
Smooth Texan One College Station, Texas
Smooth Texan Three College Station, Texas
Smooth Texan Two College Station, Texas
Smooth Zest One College Station, Texas
Smooth Zest Two College Station, Texas
Spring Pearl Le Grand, California
Sunectwentryfour Bakersfield, California
Sweet August Le Grand, California
Sweet Surprise Le Grand, California
Taylor 14L22 Reedley, California
Western Sweet Le Grand, California
Peach Hours Bloom Origin Weather Pollination
Alisio 15 La Alberca, Murcia, Spain
Angelus Mid Season Self
Belle Of Georgia
Blushing Star
Bright Princess Le Grand, California
Burpeacheight Fowler, California
Burpeacheleven Fowler, California
Burpeachfi fteen Fowler, California
Burpeachfi ve Fowler, California
Burpeachfour Fowler, California
Burpeachfourteen Fowler, California
Burpeachnine Fowler, California
Burpeachnineteen Fowler, California
Burpeachone Fowler, California
Burpeachseven Fowler, California
Burpeachseventeen Fowler, California
Burpeachsix Fowler, California
Burpeachsixteen Fowler, California
Burpeachten Fowler, California
Burpeachthireteen Fowler, California
Burpeachthirty Oakdale, California
Burpeachthirtyfive Oakdale, California
Burpeachthirtyfour Oakdale, California
Burpeachthirtyone Oakdale, California
Burpeachthirtythree Oakdale, California
Burpeachthirtytwo Oakdale, California
Burpeachthree Fowler, California
Burpeachtwelve Fowler, California
Burpeachtwenty Fowler, California
Burpeachtwentynine Oakdale, California
Burpeachtwo Fowler, California
Calara Fowler, California
Canadian Harmony Early-Mid Season Self
Cary Mac
Contender Raleigh, North Carolina 30° F | 90° F | 4.7 in
Cresthaven Mid Season East Lansing, Michigan 17° F | 82° F | 3.6 in Self
Desiree Early Rutgers University, New Jersey Self
Dixon Cling Early Self
Earlitreat 500 Mid Season Self
Elberta 600 Mid Season Self
Elegant Lady Mid Season Self
FA 1566 Coloma, Michigan
Fairtime 400 - 500 Mid Season Self
Fire Gem Modesto, California
Frost Self
Galaxy 500-600 Early Self
Glohaven
Glowingstar East Lansing, Michigan 17° F | 82° F | 3.6 in
Golden Zest College Station, Texas
Gulfsnow Attapulgus, Georgia
Ice Queen Le Grand, California
Indian Cling Very Late Self
Indian Free Late-Very Late Needs Partner
J.H. Hale Needs Partner
July Elberta 400-500 Early-Mid Season Self
Klamath Modesto, California
Loring Late-Mid Season Springfield, Missosuri 22° F | 89° F | 5.1 in Self
Madison
May Sweet Modesto, California
Monroe
Muir 600 - 700 Late-Very Late Self
Nectar Early-Mid Season Self
OHenry Late-Mid Season Self
Parade
Pearl Princess XII Le Grand, California
PF 24 C Coloma, Michigan
PF 8 Ball White Coloma, Michigan
PF 9A-007 Coloma, Michigan
PF Late 8 Ball Coloma, Michigan
PF Legendary Coloma, Michigan
PF Lucky 21 Coloma, Michigan
PF Paramount 24 Coloma, Michigan
Raritan Rose New Brunswick, New Jersey 22° F | 86° F | 5.1 in
Red Globe
Red Haven East Lansing, Michigan 17° F | 82° F | 3.6 in Self
Red Princess Le Grand, California
Redskin Mid Season Self
Reliance New Hampshire 13° F | 79° F | 4.8 in
Rich Fire Modesto, California
Rich Snow Modesto, California
Royal Zest Four College Station, Texas
Royal Zest One College Station, Texas
Royal Zest Three College Station, Texas
Royal Zest Two College Station, Texas
Saturn 200 - 300 New Jersey Self
Sauzee Gem Modesto, California
Sierra Gem Reedley, California
Sierra Princess Le Grand, California
Snow Bliss Modesto, California
Snow Fall Modesto, California
Snow Lady Rose Modesto, California
Snow Peak Modesto, California
Snow Pride Modesto, California
Spring Candy Le Grand, California
Sugar Time Modesto, California
Sugarpeach Le Grand, California
Summer Amelia Modesto, California
Summer Fire Modesto, California
Summer Frost Modesto, California
Summer Princess Le Grand, California
Suncrest 500 Late-Mid Season Western France Self
Supecheighteen Bakersfield, California
Super Lady Modesto, California
Sureprince
Sweet Alice Modesto, California
Sweet Henry Modesto, California
Sweet Shasta Modesto, California
TexFirst College Station, Texas
UFBest Gainesville, Florida
UFGem Gainesville, Florida
Veteran Self
White County University Of Arkansas
White River
White Rock University Of Arkansas
White Zest One College Station, Texas
Quince Hours Bloom Origin Weather Pollination
Pineapple 300 Self
Sweet Cherry Hours Bloom Origin Weather Pollination
Aramat Horice, Czech Republic
Arvin Glen Le Grand, California
Attika Czechoslovakia 24° F | 73° F | 2.7 in
Benton Mid Season Prosser, Washington 27° F | 90° F | 1.4 in Self
Bing Mid Season Milwaukie, Oregon 36° F | 80° F | 6.9 in Black Tartarian, Van, Rainier, Stella
Black Gold Geneva, New York 16° F | 80° F | 3.7 in Self
Black Pearl Needs Partner
Black Tartarian Mid Season Circassia, Russia 14° F | 73° F | 3.9 in
Black York Geneva, New York 16° F | 80° F | 3.7 in
BlushingGold Geneva, New York 16° F | 80° F | 3.7 in
Burgundy Pearl Needs Partner
Burlat Bologna, Italy 30° F | 86° F | 2.8 in
Celeste Self
Chelan Prosser, Washington 27° F | 90° F | 1.4 in Rainier, Bing, Lapins, Sweetheart
Cowiche Washington State University
Cristalina Bing, Rainier, Skeena
Dame Nancy Lenswood, South Australia
Dame Roma Lenswood, South Australia
Early Robin Mattawa, Washington
El Capitan Le Grand, California
Firelam Elne, France
Glenare Le Grand, California
Glenearly Le Grand, California
Glenred Le Grand, California
Glenrock Le Grand, California
Goodwin Wenatchee, Washington 25° F | 88° F | 1.5 in
Hartland Geneva, New York 16° F | 80° F | 3.7 in
Hedelfingen Stuttgart, Germany 28° F | 75° F | 3.1 in
Hudson Geneva, New York 16° F | 80° F | 3.7 in
Kiona Washington State University
Kootenay Creston, British Columbia
Korvik Horice, Czech Republic
Kristin Geneva, New York 16° F | 80° F | 3.7 in
Lambert Portland, Oregon 36° F | 80° F | 6.9 in Van, Rainier, Black Tartarian
Lapins 500 Mid Season British Columbia 34° F | 72° F | 7.9 in Self
Maddison Malaga, Washington
Merton Glory Flowering Group 2
MG200 Orondo, Washington
Minnie Royal Modesto, California
PC8011-3 Prosser, Washington 27° F | 90° F | 1.4 in
Rainier Mid Season Pullman, Washington 24° F | 84° F | 2.9 in Van, Black Tartarian, Bing, Lapins
Regal Lee Modesto, California
Regina York, Germany 23° F | 73° F | 1.6 in Stardust, Sam
Rosie Rainier Modesto, California
Rosilam Elne, France
Royal Anne Mid Season Van, Black Tartarian
Royal Bailey Modesto, California
Royal Belle Modesto, California
Royal Brynn Modesto, California
Royal Dawn Modesto, California
Royal Edie Modesto, California
Royal Elaine Modesto, California
Royal Hazel Modesto, California
Royal Helen Modesto, California
Royal Kay Modesto, California
Royal Lydia Modesto, California
Royal Lynn Modesto, California
Royal Marie Modesto, California
Royal Tioga Modesto, California
RR2a Wenatchee, Washington 25° F | 88° F | 1.5 in
Rubilam Elne, France
Sam British Columbia 34° F | 72° F | 7.9 in
Sandra Rose Self
Santina Summerland, British Columbia 23° F | 83° F | 1.4 in Self
Sequoia Le Grand, California
Sir Don Lenswood, South Australia
Sir Douglas Lenswood, South Australia
Sir Hans Lenswood, South Australia
Sir Tom Lenswood, South Australia
Skeena Summerland, British Columbia 23° F | 83° F | 1.4 in Self
Skyler Rae Wenatchee, Washington 25° F | 88° F | 1.5 in
SR500 Wenatchee, Washington 25° F | 88° F | 1.5 in
Staccato Summerland, British Columbia 23° F | 83° F | 1.4 in
Stardust Summerland, British Columbia 23° F | 83° F | 1.4 in
Stella 400 Late-Mid Season Flowering Group 4
Sunset Bing Wenatchee, Washington 25° F | 88° F | 1.5 in
Sweet Aryana University Of Bologna, Italy
Sweet Gabriel University Of Bologna, Italy
Sweet Lorenz University Of Bologna, Italy
Sweet Saretta University Of Bologna, Italy
Sweet Valina University Of Bologna, Italy
Sweetheart Early-Mid Season Summerland, British Columbia 23° F | 83° F | 1.4 in Flowering Group 4
Ulster Geneva, New York 16° F | 80° F | 3.7 in
Van Late-Mid Season Summerland, British Columbia 23° F | 83° F | 1.4 in Flowering Group 3
White Gold Geneva, New York 16° F | 80° F | 3.7 in
Tart Bush Cherry Hours Bloom Origin Weather Pollination
Joy New Hampshire 13° F | 79° F | 4.8 in
Tart Cherry Hours Bloom Origin Weather Pollination
Balaton Hungary 27° F | 81° F | 2.7 in
Early Richmond Very Late Richmond, Virginia 28° F | 90° F | 4.7 in Self
English Morelio 500 Very Late Self
Jubileum East Lansing, Michigan 17° F | 82° F | 3.6 in
Meteor Very Late Saint Paul, Minnesota 7° F | 83° F | 4.9 in Self
Montmorency 500 Very Late Montmorency Valley, France 0° F | 73° F | 2.5 in Self
Northstar 500 Very Late Saint Paul, Minnesota 7° F | 83° F | 4.9 in Self
Surefire Geneva, New York 16° F | 80° F | 3.7 in