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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 782 703
  171 Union City 627 605
Amador 227 Plymouth 1443 1231
Butte 012 Durham 879 799
Colusa 032 Colusa 814 765
Contra Costa 047 Brentwood 592 569
  170 Concord 1031 908
  213 El Cerrito 395 395
  178 Moraga 1022 850
El Dorado 013 Camino 1419 1295
  228 Diamond Springs 1147 1102
Fresno 205 Coalinga 817 790
  007 Firebaugh/Telles 849 799
  190 Five Points South West 901 794
  002 FivePoints/WSFS USDA 1002 880
  080 Fresno State 945 854
  142 Orange Cove 1059 953
  124 Panoche 872 791
  039 Parlier 980 910
  105 Westlands 933 843
Imperial 041 Calipatria/Mulberry 682 608
  087 Meloland 410 404
  175 Palo Verde II 807 713
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 289 273
  201 UC-Andrade 318 312
  186 UC-San Luis 549 527
  181 Westmorland North 557 536
Inyo 035 Bishop 1746 811
  183 Owens Lake North 1684 1152
  189 Owens Lake South 1655 916
Kern 125 Arvin-Edison 858 770
  146 Belridge 857 769
  054 Blackwells Corner 1076 961
  005 Shafter/USDA 975 846
Kings 021 Kettleman 812 782
  015 Stratford 968 858
Lassen 057 Buntingville 2039 796
Los Angeles 216 Arleta 302 302
  215 Chatsworth 262 258
  133 Glendale 0 0
  174 Long Beach 391 390
  159 Monrovia 301 301
  197 Palmdale 1391 865
  220 Palmdale Central 1224 952
  078 Pomona 425 422
  204 Santa Clarita 534 519
  099 Santa Monica 35 35
  219 West Hills 320 317
Madera 145 Madera 0 0
  188 Madera II 943 853
Marin 187 Black Point 688 584
  157 Point San Pedro 952 830
Mendocino 085 Hopland FS 892 829
  106 Sanel Valley 940 768
Merced 092 Kesterson 918 779
  056 Los Banos 932 821
  148 Merced 1098 928
Modoc 090 Alturas 2152 989
Monterey 114 Arroyo Seco 720 672
  210 Carmel 625 619
  019 Castroville 559 551
  113 King City-Oasis Rd. 967 861
  193 Pacific Grove 151 151
  129 Pajaro 571 565
  116 Salinas North 974 949
  214 Salinas South II 529 529
Napa 109 Carneros 797 683
  077 Oakville 704 638
Orange 245 Coto de Caza 414 414
  075 Irvine 186 186
  241 San Clemente 418 417
Placer 195 Auburn 740 727
Riverside 135 Blythe NE 709 651
  118 Cathedral City 0 0
  239 Hemet 698 655
  200 Indio 2 365 360
  208 La Quinta II 431 426
  238 Moreno Valley 414 401
  136 Oasis 276 276
  240 Perris 701 637
  151 Ripley 751 691
  062 Temecula 89 89
  237 Temecula East III 378 378
  218 Thermal South 648 600
  044 U.C. Riverside 326 326
  179 Winchester 723 649
Sacramento 131 Fair Oaks 713 661
  140 Twitchell Island 757 726
San Benito 126 San Benito 688 645
  143 San Juan Valley 789 707
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2034 669
  233 Joshua Tree 1131 892
  192 Lake Arrowhead 1868 933
  234 Newberry Springs II 1125 901
  117 Victorville 1260 936
San Diego 207 Borrego Springs 633 562
  153 Escondido SPV 696 639
  150 Miramar 192 192
  147 Otay Lake 202 202
  184 San Diego II 76 76
  173 Torrey Pines 30 30
San Joaquin 166 Lodi West 0 0
  070 Manteca 879 795
  167 Tracy 737 700
San Luis Obispo 163 Atascadero 1052 788
  202 Nipomo 286 286
  052 San Luis Obispo 285 281
  160 San Luis Obispo West 404 403
Santa Barbara 088 Cuyama 1347 1084
  094 Goleta Foothills 3 3
  231 Lompoc 766 673
  107 Santa Barbara 223 223
  230 Santa Barbara II 13 13
  232 Santa Maria II 501 498
  064 Santa Ynez 874 690
  165 Sisquoc 593 583
Santa Clara 211 Gilroy 760 667
Santa Cruz 104 De Laveaga 661 653
  209 Watsonville West II 430 429
Shasta 043 McArthur 2093 1211
  224 Shasta College 1123 1001
Siskiyou 236 Macdoel II 2113 936
  225 Scott Valley 1966 1267
  091 Tulelake FS 2147 1024
Solano 121 Dixon 1024 946
  212 Hastings Tract East 855 773
  139 Winters 794 737
Sonoma 158 Bennett Valley 890 789
  144 Petaluma East 1207 1044
  083 Santa Rosa 839 693
  103 Windsor 954 806
Stanislaus 206 Denair 825 781
  071 Modesto 923 854
  194 Oakdale 922 841
  161 Patterson 648 591
Sutter 235 Verona 862 796
Tehama 008 Gerber 0 0
  222 Gerber South 822 796
Tulare 203 Alpaugh 1318 1001
  182 Delano 1175 1011
  086 Lindcove 956 879
  169 Porterville 1719 1233
Ventura 152 Camarillo 362 362
  217 Moorpark 230 230
  156 Oxnard 160 160
  198 Santa Paula 418 415
Yolo 155 Bryte 693 677
  006 Davis 732 706
  196 Esparto 468 460
  226 Woodland 728 710
Yuba 084 Browns Valley 606 591
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