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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 884 805
  171 Union City 689 667
Amador 227 Plymouth 1559 1347
Butte 012 Durham 968 888
Colusa 032 Colusa 895 846
Contra Costa 047 Brentwood 621 598
  170 Concord 1251 1121
  213 El Cerrito 400 400
  178 Moraga 1179 1007
El Dorado 013 Camino 1484 1360
  228 Diamond Springs 1193 1148
Fresno 205 Coalinga 878 851
  007 Firebaugh/Telles 909 859
  190 Five Points South West 985 878
  002 FivePoints/WSFS USDA 1100 978
  080 Fresno State 1050 959
  142 Orange Cove 1156 1050
  124 Panoche 960 879
  039 Parlier 1059 989
  105 Westlands 1060 970
Imperial 041 Calipatria/Mulberry 759 685
  087 Meloland 420 414
  175 Palo Verde II 889 795
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 311 295
  201 UC-Andrade 318 312
  186 UC-San Luis 564 542
  181 Westmorland North 622 601
Inyo 035 Bishop 1987 979
  183 Owens Lake North 1853 1318
  189 Owens Lake South 1901 1087
Kern 125 Arvin-Edison 904 816
  146 Belridge 910 822
  054 Blackwells Corner 1199 1084
  005 Shafter/USDA 1100 974
Kings 021 Kettleman 856 826
  015 Stratford 1051 941
Lassen 057 Buntingville 2382 1013
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 1623 1066
  220 Palmdale Central 1371 1096
  078 Pomona 425 422
  204 Santa Clarita 550 535
  099 Santa Monica 35 35
  219 West Hills 328 325
Madera 145 Madera 0 0
  188 Madera II 1070 980
Marin 187 Black Point 809 705
  157 Point San Pedro 952 830
Mendocino 085 Hopland FS 997 934
  106 Sanel Valley 1100 928
Merced 092 Kesterson 1029 889
  056 Los Banos 1035 924
  148 Merced 1286 1116
Modoc 090 Alturas 2505 1243
Monterey 114 Arroyo Seco 799 751
  210 Carmel 665 659
  019 Castroville 600 592
  113 King City-Oasis Rd. 1107 1001
  193 Pacific Grove 154 154
  129 Pajaro 612 606
  116 Salinas North 1072 1047
  214 Salinas South II 545 545
Napa 109 Carneros 919 805
  077 Oakville 830 764
Orange 245 Coto de Caza 420 420
  075 Irvine 193 193
  241 San Clemente 433 432
Placer 195 Auburn 757 744
Riverside 135 Blythe NE 767 709
  118 Cathedral City 0 0
  239 Hemet 717 674
  200 Indio 2 369 364
  208 La Quinta II 432 427
  238 Moreno Valley 418 405
  136 Oasis 276 276
  240 Perris 746 682
  151 Ripley 823 763
  062 Temecula 89 89
  237 Temecula East III 378 378
  218 Thermal South 675 627
  044 U.C. Riverside 326 326
  179 Winchester 798 724
Sacramento 131 Fair Oaks 766 714
  140 Twitchell Island 830 799
San Benito 126 San Benito 771 728
  143 San Juan Valley 883 801
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2396 812
  233 Joshua Tree 1241 1002
  192 Lake Arrowhead 2178 1120
  234 Newberry Springs II 1229 1005
  117 Victorville 1415 1089
San Diego 207 Borrego Springs 686 615
  153 Escondido SPV 799 742
  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 980 896
  167 Tracy 836 799
San Luis Obispo 163 Atascadero 1210 946
  202 Nipomo 299 299
  052 San Luis Obispo 309 305
  160 San Luis Obispo West 444 443
Santa Barbara 088 Cuyama 1553 1284
  094 Goleta Foothills 3 3
  231 Lompoc 889 796
  107 Santa Barbara 223 223
  230 Santa Barbara II 13 13
  232 Santa Maria II 533 530
  064 Santa Ynez 1050 866
  165 Sisquoc 639 629
Santa Clara 211 Gilroy 852 759
Santa Cruz 104 De Laveaga 697 689
  209 Watsonville West II 436 435
Shasta 043 McArthur 2423 1483
  224 Shasta College 1261 1139
Siskiyou 236 Macdoel II 2499 1136
  225 Scott Valley 2325 1570
  091 Tulelake FS 2519 1261
Solano 121 Dixon 1179 1101
  212 Hastings Tract East 855 773
  139 Winters 884 827
Sonoma 158 Bennett Valley 1016 915
  144 Petaluma East 1416 1253
  083 Santa Rosa 1007 861
  103 Windsor 1102 954
Stanislaus 206 Denair 938 894
  071 Modesto 1045 976
  194 Oakdale 1032 951
  161 Patterson 661 604
Sutter 235 Verona 980 914
Tehama 008 Gerber 0 0
  222 Gerber South 879 853
Tulare 203 Alpaugh 1577 1193
  182 Delano 1307 1143
  086 Lindcove 1029 952
  169 Porterville 1997 1491
Ventura 152 Camarillo 378 378
  217 Moorpark 233 233
  156 Oxnard 161 161
  198 Santa Paula 420 417
Yolo 155 Bryte 720 704
  006 Davis 796 770
  196 Esparto 482 474
  226 Woodland 774 756
Yuba 084 Browns Valley 611 596
Webmaster Email: fruitsandnuts@ucdavis.edu