Fruit & Nut Research & Information Center
Fruit & Nut Research & Information Center
Fruit & Nut Research & Information Center
University of California
Fruit & Nut Research & Information Center

Chill Calculators

Cumulative Chilling Hours:
Cumulative Chill Hours and
Modified Chill Hours
Hours below 45° F
Hours between 32 F and 45° F
November 1 through February 28/29.

Cumulative Chilling Portions:
Dynamic Model
September 1 through August 31

Chilling Hour & Unit Accumulations:
Historic Accumulation of
Chill Hours, Modified Chill Hours,
& Chill Units (Utah Model)

Hours below 45° F
Hours between 32° F and 45° F
September 1 through August 31

Harvest Prediction Model:
for Peaches, Plums and Nectarines

Cumulative Chilling Hours - Select Station from List

County Station Hours < 45°F Hours >32° and <45°F
Alameda 191 Pleasanton 819 746
  171 Union City 1028 974
Amador 227 Plymouth 1114 1044
Butte 012 Durham 900 816
Colusa 250 Williams 844 768
Contra Costa 047 Brentwood 665 643
  170 Concord 911 860
  213 El Cerrito 527 375
  178 Moraga 959 836
El Dorado 013 Camino 748 691
  228 Diamond Springs 694 652
Fresno 205 Coalinga 860 823
  007 Firebaugh/Telles 751 683
  190 Five Points South West 862 745
  002 FivePoints/WSFS USDA 916 779
  080 Fresno State 842 782
  142 Orange Cove 870 799
  124 Panoche 932 815
  039 Parlier 893 832
  105 Westlands 917 778
Imperial 041 Calipatria/Mulberry 497 477
  087 Meloland 281 281
  175 Palo Verde II 714 619
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 375 373
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 322 321
Inyo 035 Bishop 1673 898
  183 Owens Lake North 1493 1069
  189 Owens Lake South 1552 951
Kern 125 Arvin-Edison 775 736
  146 Belridge 820 762
  054 Blackwells Corner 1076 913
  005 Shafter/USDA 938 790
Kings 021 Kettleman 0 0
  015 Stratford 885 776
Lassen 057 Buntingville 2163 985
Los Angeles 216 Arleta 110 110
  215 Chatsworth 72 72
  133 Glendale 0 0
  174 Long Beach 241 241
  159 Monrovia 107 107
  197 Palmdale 1160 808
  220 Palmdale Central 892 750
  078 Pomona 242 238
  204 Santa Clarita 200 200
  099 Santa Monica 16 16
  219 West Hills 133 133
Madera 145 Madera 0 0
  188 Madera II 1395 1102
Marin 187 Black Point 933 816
  157 Point San Pedro 639 627
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1104 853
Merced 092 Kesterson 1102 866
  056 Los Banos 865 737
  148 Merced 1147 850
Modoc 090 Alturas 2207 1042
Monterey 114 Arroyo Seco 697 661
  210 Carmel 451 449
  019 Castroville 775 664
  113 King City-Oasis Rd. 785 709
  193 Pacific Grove 119 119
  129 Pajaro 392 385
  116 Salinas North 436 428
  214 Salinas South II 378 377
Napa 109 Carneros 1016 853
  077 Oakville 924 884
Orange 245 Coto de Caza 218 214
  075 Irvine 91 91
  241 San Clemente 241 237
Placer 195 Auburn 563 545
Riverside 135 Blythe NE 514 495
  118 Cathedral City 0 0
  239 Hemet 352 335
  200 Indio 2 196 196
  208 La Quinta II 321 302
  238 Moreno Valley 111 106
  136 Oasis 74 74
  240 Perris 442 413
  151 Ripley 588 550
  062 Temecula 80 71
  237 Temecula East III 114 114
  218 Thermal South 397 393
  044 U.C. Riverside 140 139
  179 Winchester 546 515
Sacramento 131 Fair Oaks 716 700
  140 Twitchell Island 682 660
San Benito 126 San Benito 719 691
  143 San Juan Valley 722 684
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1911 939
  233 Joshua Tree 876 784
  192 Lake Arrowhead 1652 997
  234 Newberry Springs II 883 774
  117 Victorville 35 35
San Diego 207 Borrego Springs 429 409
  153 Escondido SPV 650 605
  150 Miramar 148 148
  147 Otay Lake 217 217
  184 San Diego II 34 34
  173 Torrey Pines 22 22
San Joaquin 166 Lodi West 0 0
  070 Manteca 963 835
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 1086 777
  202 Nipomo 181 181
  052 San Luis Obispo 181 181
  160 San Luis Obispo West 315 310
Santa Barbara 088 Cuyama 1147 937
  094 Goleta Foothills 0 0
  231 Lompoc 737 692
  107 Santa Barbara 103 103
  230 Santa Barbara II 10 10
  232 Santa Maria II 368 366
  064 Santa Ynez 811 618
  165 Sisquoc 825 712
Santa Clara 211 Gilroy 801 702
Santa Cruz 104 De Laveaga 397 396
  209 Watsonville West II 309 309
Shasta 043 McArthur 2193 1286
  224 Shasta College 919 753
Siskiyou 236 Macdoel II 2278 985
  225 Scott Valley 2170 1181
  091 Tulelake FS 2287 1041
Solano 121 Dixon 1300 851
  212 Hastings Tract East 1635 1170
  139 Winters 863 787
Sonoma 158 Bennett Valley 1077 1010
  144 Petaluma East 2196 1355
  083 Santa Rosa 1107 905
  103 Windsor 1010 883
Stanislaus 206 Denair 873 795
  071 Modesto 880 723
  194 Oakdale 896 854
  161 Patterson 227 189
Sutter 235 Verona 886 789
Tehama 008 Gerber 0 0
  222 Gerber South 855 785
Tulare 203 Alpaugh 283 231
  182 Delano 362 273
  086 Lindcove 1020 952
  169 Porterville 1343 1064
Ventura 152 Camarillo 251 250
  217 Moorpark 95 95
  156 Oxnard 0 0
  198 Santa Paula 225 215
Yolo 155 Bryte 624 618
  006 Davis 746 718
  196 Esparto 0 0
  226 Woodland 682 659
Yuba 084 Browns Valley 462 446
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