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 847 762
  171 Union City 1052 986
Amador 227 Plymouth 1152 1061
Butte 012 Durham 931 829
Colusa 250 Williams 875 785
Contra Costa 047 Brentwood 693 671
  170 Concord 938 874
  213 El Cerrito 553 401
  178 Moraga 988 851
El Dorado 013 Camino 796 718
  228 Diamond Springs 738 680
Fresno 205 Coalinga 888 849
  007 Firebaugh/Telles 776 702
  190 Five Points South West 888 763
  002 FivePoints/WSFS USDA 944 797
  080 Fresno State 870 805
  142 Orange Cove 896 815
  124 Panoche 957 833
  039 Parlier 921 856
  105 Westlands 943 792
Imperial 041 Calipatria/Mulberry 515 495
  087 Meloland 296 296
  175 Palo Verde II 730 633
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 388 386
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 328 327
Inyo 035 Bishop 1719 919
  183 Owens Lake North 1537 1093
  189 Owens Lake South 1594 974
Kern 125 Arvin-Edison 801 757
  146 Belridge 849 786
  054 Blackwells Corner 1107 938
  005 Shafter/USDA 964 809
Kings 021 Kettleman 0 0
  015 Stratford 913 798
Lassen 057 Buntingville 2211 999
Los Angeles 216 Arleta 134 134
  215 Chatsworth 98 98
  133 Glendale 0 0
  174 Long Beach 254 254
  159 Monrovia 128 128
  197 Palmdale 1197 833
  220 Palmdale Central 928 776
  078 Pomona 266 261
  204 Santa Clarita 228 228
  099 Santa Monica 22 22
  219 West Hills 153 153
Madera 145 Madera 0 0
  188 Madera II 1422 1117
Marin 187 Black Point 957 832
  157 Point San Pedro 661 643
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1137 868
Merced 092 Kesterson 1131 882
  056 Los Banos 893 754
  148 Merced 1175 863
Modoc 090 Alturas 2255 1042
Monterey 114 Arroyo Seco 724 682
  210 Carmel 470 464
  019 Castroville 797 680
  113 King City-Oasis Rd. 813 728
  193 Pacific Grove 132 132
  129 Pajaro 418 401
  116 Salinas North 463 449
  214 Salinas South II 404 403
Napa 109 Carneros 1045 863
  077 Oakville 953 897
Orange 245 Coto de Caza 245 241
  075 Irvine 109 109
  241 San Clemente 259 255
Placer 195 Auburn 594 568
Riverside 135 Blythe NE 529 510
  118 Cathedral City 0 0
  239 Hemet 382 359
  200 Indio 2 210 210
  208 La Quinta II 331 312
  238 Moreno Valley 137 131
  136 Oasis 74 74
  240 Perris 468 433
  151 Ripley 601 563
  062 Temecula 88 79
  237 Temecula East III 136 136
  218 Thermal South 409 405
  044 U.C. Riverside 154 153
  179 Winchester 572 534
Sacramento 131 Fair Oaks 743 713
  140 Twitchell Island 708 683
San Benito 126 San Benito 744 709
  143 San Juan Valley 750 710
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1959 948
  233 Joshua Tree 904 806
  192 Lake Arrowhead 1696 1007
  234 Newberry Springs II 912 795
  117 Victorville 35 35
San Diego 207 Borrego Springs 438 415
  153 Escondido SPV 677 632
  150 Miramar 164 164
  147 Otay Lake 243 243
  184 San Diego II 41 41
  173 Torrey Pines 31 31
San Joaquin 166 Lodi West 0 0
  070 Manteca 990 851
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 1113 787
  202 Nipomo 204 204
  052 San Luis Obispo 204 204
  160 San Luis Obispo West 340 331
Santa Barbara 088 Cuyama 1187 959
  094 Goleta Foothills 0 0
  231 Lompoc 753 703
  107 Santa Barbara 119 119
  230 Santa Barbara II 10 10
  232 Santa Maria II 393 391
  064 Santa Ynez 839 636
  165 Sisquoc 850 730
Santa Clara 211 Gilroy 826 716
Santa Cruz 104 De Laveaga 422 418
  209 Watsonville West II 334 334
Shasta 043 McArthur 2241 1301
  224 Shasta College 953 766
Siskiyou 236 Macdoel II 2302 990
  225 Scott Valley 2218 1201
  091 Tulelake FS 2281 1062
Solano 121 Dixon 1330 868
  212 Hastings Tract East 1664 1183
  139 Winters 889 807
Sonoma 158 Bennett Valley 1107 1023
  144 Petaluma East 2245 1374
  083 Santa Rosa 1138 923
  103 Windsor 1037 899
Stanislaus 206 Denair 900 809
  071 Modesto 910 742
  194 Oakdale 926 870
  161 Patterson 227 189
Sutter 235 Verona 916 803
Tehama 008 Gerber 0 0
  222 Gerber South 887 803
Tulare 203 Alpaugh 283 231
  182 Delano 391 296
  086 Lindcove 1051 975
  169 Porterville 1372 1085
Ventura 152 Camarillo 272 271
  217 Moorpark 116 116
  156 Oxnard 0 0
  198 Santa Paula 250 240
Yolo 155 Bryte 655 649
  006 Davis 774 739
  196 Esparto 0 0
  226 Woodland 709 680
Yuba 084 Browns Valley 490 466
Webmaster Email: fruitsandnuts@ucdavis.edu