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 857 782
  171 Union City 812 761
Amador 227 Plymouth 1584 1350
Butte 012 Durham 1015 876
Colusa 250 Williams 960 904
Contra Costa 047 Brentwood 704 690
  170 Concord 1405 1120
  213 El Cerrito 674 636
  178 Moraga 1013 901
El Dorado 013 Camino 1460 1270
  228 Diamond Springs 1298 1235
Fresno 205 Coalinga 867 823
  007 Firebaugh/Telles 813 762
  190 Five Points South West 765 667
  002 FivePoints/WSFS USDA 863 758
  080 Fresno State 804 746
  142 Orange Cove 865 802
  124 Panoche 930 840
  039 Parlier 824 794
  105 Westlands 847 752
Imperial 041 Calipatria/Mulberry 441 430
  087 Meloland 263 262
  175 Palo Verde II 541 526
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 313 308
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 360 355
Inyo 035 Bishop 1999 1170
  183 Owens Lake North 1669 1271
  189 Owens Lake South 1583 1057
Kern 125 Arvin-Edison 692 661
  146 Belridge 765 720
  054 Blackwells Corner 1216 921
  005 Shafter/USDA 868 819
Kings 021 Kettleman 444 395
  015 Stratford 841 755
Lassen 057 Buntingville 2408 1074
Los Angeles 216 Arleta 184 184
  215 Chatsworth 162 162
  133 Glendale 0 0
  174 Long Beach 180 180
  159 Monrovia 214 214
  197 Palmdale 1264 995
  220 Palmdale Central 1064 918
  078 Pomona 308 308
  204 Santa Clarita 365 365
  099 Santa Monica 47 47
  219 West Hills 75 75
Madera 145 Madera 0 0
  188 Madera II 1297 1080
Marin 187 Black Point 845 777
  157 Point San Pedro 705 683
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1136 911
Merced 092 Kesterson 1001 833
  056 Los Banos 873 797
  148 Merced 1126 848
Modoc 090 Alturas 2531 1125
Monterey 114 Arroyo Seco 690 673
  210 Carmel 673 667
  019 Castroville 476 475
  113 King City-Oasis Rd. 804 746
  193 Pacific Grove 217 217
  129 Pajaro 518 518
  116 Salinas North 610 607
  214 Salinas South II 543 539
Napa 109 Carneros 988 852
  077 Oakville 1027 943
Orange 245 Coto de Caza 306 306
  075 Irvine 145 145
  241 San Clemente 273 273
Placer 195 Auburn 907 900
Riverside 135 Blythe NE 472 470
  118 Cathedral City 0 0
  239 Hemet 571 571
  200 Indio 2 196 196
  208 La Quinta II 556 467
  238 Moreno Valley 199 199
  136 Oasis 96 96
  240 Perris 411 408
  151 Ripley 492 487
  062 Temecula 73 72
  237 Temecula East III 427 427
  218 Thermal South 428 424
  044 U.C. Riverside 236 236
  179 Winchester 432 430
Sacramento 131 Fair Oaks 840 800
  140 Twitchell Island 803 790
San Benito 126 San Benito 754 715
  143 San Juan Valley 848 784
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2415 1082
  233 Joshua Tree 865 763
  192 Lake Arrowhead 2215 1585
  234 Newberry Springs II 913 794
  117 Victorville 944 787
San Diego 207 Borrego Springs 410 394
  153 Escondido SPV 498 475
  150 Miramar 131 131
  147 Otay Lake 89 89
  184 San Diego II 46 46
  173 Torrey Pines 15 15
San Joaquin 166 Lodi West 0 0
  070 Manteca 903 796
  167 Tracy 829 768
San Luis Obispo 163 Atascadero 845 694
  202 Nipomo 314 314
  052 San Luis Obispo 247 247
  160 San Luis Obispo West 475 475
Santa Barbara 088 Cuyama 1193 1078
  094 Goleta Foothills 0 0
  231 Lompoc 548 526
  107 Santa Barbara 1365 1284
  230 Santa Barbara II 28 24
  232 Santa Maria II 464 456
  064 Santa Ynez 857 704
  165 Sisquoc 719 666
Santa Clara 211 Gilroy 717 668
Santa Cruz 104 De Laveaga 1262 1149
  209 Watsonville West II 508 508
Shasta 043 McArthur 2461 1321
  224 Shasta College 1211 995
Siskiyou 236 Macdoel II 2526 1168
  225 Scott Valley 2353 1289
  091 Tulelake FS 2547 1162
Solano 121 Dixon 1330 1190
  212 Hastings Tract East 1247 1114
  139 Winters 1028 933
Sonoma 158 Bennett Valley 1229 1030
  144 Petaluma East 2593 1751
  083 Santa Rosa 1108 951
  103 Windsor 1237 1041
Stanislaus 206 Denair 848 788
  071 Modesto 900 808
  194 Oakdale 267 263
  161 Patterson 807 736
Sutter 235 Verona 1014 932
Tehama 008 Gerber 0 0
  222 Gerber South 1081 1008
Tulare 203 Alpaugh 1374 998
  182 Delano 947 858
  086 Lindcove 807 784
  169 Porterville 1154 992
Ventura 152 Camarillo 276 276
  217 Moorpark 193 193
  156 Oxnard 96 96
  198 Santa Paula 480 445
Yolo 155 Bryte 851 838
  006 Davis 874 843
  196 Esparto 676 673
  226 Woodland 908 633
Yuba 084 Browns Valley 768 761
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