Fruit & Nut Research and Information Center
Fruit & Nut Research and Information Center
Fruit & Nut Research and Information Center
University of California
Fruit & Nut Research and 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 802 727
  171 Union City 760 709
Amador 227 Plymouth 1490 1275
Butte 012 Durham 957 834
Colusa 032 Colusa 0 0
Contra Costa 047 Brentwood 660 646
  170 Concord 1318 1070
  213 El Cerrito 613 575
  178 Moraga 943 845
El Dorado 013 Camino 1358 1190
  228 Diamond Springs 1208 1152
Fresno 205 Coalinga 796 752
  007 Firebaugh/Telles 763 712
  190 Five Points South West 714 618
  002 FivePoints/WSFS USDA 803 704
  080 Fresno State 756 700
  142 Orange Cove 811 753
  124 Panoche 874 784
  039 Parlier 770 740
  105 Westlands 786 697
Imperial 041 Calipatria/Mulberry 424 413
  087 Meloland 252 251
  175 Palo Verde II 521 506
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 301 296
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 348 343
Inyo 035 Bishop 1906 1132
  183 Owens Lake North 1589 1204
  189 Owens Lake South 1505 1004
Kern 125 Arvin-Edison 646 619
  146 Belridge 711 667
  054 Blackwells Corner 1140 855
  005 Shafter/USDA 818 772
Kings 021 Kettleman 444 395
  015 Stratford 767 687
Lassen 057 Buntingville 2288 1035
Los Angeles 216 Arleta 129 129
  215 Chatsworth 107 107
  133 Glendale 0 0
  174 Long Beach 158 158
  159 Monrovia 191 191
  197 Palmdale 1191 939
  220 Palmdale Central 995 853
  078 Pomona 277 277
  204 Santa Clarita 322 322
  099 Santa Monica 41 41
  219 West Hills 69 69
Madera 145 Madera 0 0
  188 Madera II 1230 1029
Marin 187 Black Point 784 716
  157 Point San Pedro 654 633
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1056 854
Merced 092 Kesterson 954 786
  056 Los Banos 822 746
  148 Merced 1055 800
Modoc 090 Alturas 2411 1102
Monterey 114 Arroyo Seco 639 622
  210 Carmel 610 604
  019 Castroville 432 431
  113 King City-Oasis Rd. 742 688
  193 Pacific Grove 200 200
  129 Pajaro 463 463
  116 Salinas North 563 560
  214 Salinas South II 496 492
Napa 109 Carneros 919 794
  077 Oakville 961 884
Orange 245 Coto de Caza 283 283
  075 Irvine 126 126
  241 San Clemente 251 251
Placer 195 Auburn 838 831
Riverside 135 Blythe NE 455 453
  118 Cathedral City 0 0
  239 Hemet 528 528
  200 Indio 2 189 189
  208 La Quinta II 530 441
  238 Moreno Valley 178 178
  136 Oasis 96 96
  240 Perris 376 373
  151 Ripley 472 467
  062 Temecula 50 49
  237 Temecula East III 377 377
  218 Thermal South 413 409
  044 U.C. Riverside 212 212
  179 Winchester 398 397
Sacramento 131 Fair Oaks 782 742
  140 Twitchell Island 746 733
San Benito 126 San Benito 698 663
  143 San Juan Valley 782 728
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2295 1042
  233 Joshua Tree 816 721
  192 Lake Arrowhead 2097 1511
  234 Newberry Springs II 856 738
  117 Victorville 871 725
San Diego 207 Borrego Springs 388 372
  153 Escondido SPV 474 451
  150 Miramar 116 116
  147 Otay Lake 71 71
  184 San Diego II 38 38
  173 Torrey Pines 15 15
San Joaquin 166 Lodi West 0 0
  070 Manteca 850 748
  167 Tracy 762 706
San Luis Obispo 163 Atascadero 767 635
  202 Nipomo 272 272
  052 San Luis Obispo 218 218
  160 San Luis Obispo West 424 424
Santa Barbara 088 Cuyama 1104 1006
  094 Goleta Foothills 0 0
  231 Lompoc 512 492
  107 Santa Barbara 1318 1237
  230 Santa Barbara II 27 23
  232 Santa Maria II 423 415
  064 Santa Ynez 798 654
  165 Sisquoc 668 619
Santa Clara 211 Gilroy 668 620
Santa Cruz 104 De Laveaga 1198 1086
  209 Watsonville West II 457 457
Shasta 043 McArthur 2342 1271
  224 Shasta College 1138 954
Siskiyou 236 Macdoel II 2406 1136
  225 Scott Valley 2237 1234
  091 Tulelake FS 2427 1135
Solano 121 Dixon 1260 1130
  212 Hastings Tract East 1173 1044
  139 Winters 968 875
Sonoma 158 Bennett Valley 1156 977
  144 Petaluma East 2473 1699
  083 Santa Rosa 1018 877
  103 Windsor 1147 967
Stanislaus 206 Denair 792 735
  071 Modesto 846 755
  194 Oakdale 216 215
  161 Patterson 738 668
Sutter 235 Verona 949 867
Tehama 008 Gerber 0 0
  222 Gerber South 1013 944
Tulare 203 Alpaugh 1312 947
  182 Delano 897 812
  086 Lindcove 756 736
  169 Porterville 1075 934
Ventura 152 Camarillo 241 241
  217 Moorpark 156 156
  156 Oxnard 96 96
  198 Santa Paula 439 404
Yolo 155 Bryte 802 789
  006 Davis 815 784
  196 Esparto 627 624
  226 Woodland 850 575
Yuba 084 Browns Valley 701 694
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