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 806 733
  171 Union City 1006 962
Amador 227 Plymouth 1090 1027
Butte 012 Durham 883 802
Colusa 250 Williams 828 763
Contra Costa 047 Brentwood 651 629
  170 Concord 897 846
  213 El Cerrito 512 360
  178 Moraga 944 824
El Dorado 013 Camino 724 679
  228 Diamond Springs 670 639
Fresno 205 Coalinga 847 810
  007 Firebaugh/Telles 740 673
  190 Five Points South West 851 740
  002 FivePoints/WSFS USDA 905 775
  080 Fresno State 828 768
  142 Orange Cove 856 789
  124 Panoche 920 805
  039 Parlier 879 818
  105 Westlands 905 773
Imperial 041 Calipatria/Mulberry 487 467
  087 Meloland 275 275
  175 Palo Verde II 706 615
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 368 366
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 320 319
Inyo 035 Bishop 1651 888
  183 Owens Lake North 1472 1057
  189 Owens Lake South 1531 938
Kern 125 Arvin-Edison 766 731
  146 Belridge 810 753
  054 Blackwells Corner 1062 900
  005 Shafter/USDA 929 786
Kings 021 Kettleman 0 0
  015 Stratford 874 769
Lassen 057 Buntingville 2139 974
Los Angeles 216 Arleta 99 99
  215 Chatsworth 59 59
  133 Glendale 0 0
  174 Long Beach 234 234
  159 Monrovia 99 99
  197 Palmdale 1145 800
  220 Palmdale Central 877 737
  078 Pomona 234 230
  204 Santa Clarita 188 188
  099 Santa Monica 9 9
  219 West Hills 121 121
Madera 145 Madera 0 0
  188 Madera II 1380 1091
Marin 187 Black Point 920 803
  157 Point San Pedro 632 620
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1084 835
Merced 092 Kesterson 1090 861
  056 Los Banos 853 727
  148 Merced 1131 841
Modoc 090 Alturas 2183 1042
Monterey 114 Arroyo Seco 684 648
  210 Carmel 442 440
  019 Castroville 766 655
  113 King City-Oasis Rd. 771 698
  193 Pacific Grove 116 116
  129 Pajaro 381 374
  116 Salinas North 424 416
  214 Salinas South II 367 366
Napa 109 Carneros 1001 844
  077 Oakville 910 875
Orange 245 Coto de Caza 207 203
  075 Irvine 87 87
  241 San Clemente 233 229
Placer 195 Auburn 543 525
Riverside 135 Blythe NE 505 486
  118 Cathedral City 0 0
  239 Hemet 339 322
  200 Indio 2 191 191
  208 La Quinta II 316 297
  238 Moreno Valley 99 94
  136 Oasis 74 74
  240 Perris 430 406
  151 Ripley 578 542
  062 Temecula 68 59
  237 Temecula East III 91 91
  218 Thermal South 389 385
  044 U.C. Riverside 132 131
  179 Winchester 533 506
Sacramento 131 Fair Oaks 698 682
  140 Twitchell Island 668 646
San Benito 126 San Benito 706 678
  143 San Juan Valley 708 674
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1887 939
  233 Joshua Tree 863 778
  192 Lake Arrowhead 1628 991
  234 Newberry Springs II 872 769
  117 Victorville 35 35
San Diego 207 Borrego Springs 421 401
  153 Escondido SPV 638 593
  150 Miramar 141 141
  147 Otay Lake 209 209
  184 San Diego II 28 28
  173 Torrey Pines 19 19
San Joaquin 166 Lodi West 0 0
  070 Manteca 950 827
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 1072 771
  202 Nipomo 170 170
  052 San Luis Obispo 171 171
  160 San Luis Obispo West 304 299
Santa Barbara 088 Cuyama 1131 929
  094 Goleta Foothills 0 0
  231 Lompoc 728 687
  107 Santa Barbara 95 95
  230 Santa Barbara II 10 10
  232 Santa Maria II 358 356
  064 Santa Ynez 800 614
  165 Sisquoc 811 701
Santa Clara 211 Gilroy 788 691
Santa Cruz 104 De Laveaga 382 381
  209 Watsonville West II 295 295
Shasta 043 McArthur 2169 1281
  224 Shasta College 903 750
Siskiyou 236 Macdoel II 2254 985
  225 Scott Valley 2146 1173
  091 Tulelake FS 2263 1034
Solano 121 Dixon 1285 839
  212 Hastings Tract East 1620 1158
  139 Winters 848 772
Sonoma 158 Bennett Valley 1062 1000
  144 Petaluma East 2173 1346
  083 Santa Rosa 1092 898
  103 Windsor 995 875
Stanislaus 206 Denair 857 786
  071 Modesto 867 718
  194 Oakdale 883 844
  161 Patterson 227 189
Sutter 235 Verona 869 773
Tehama 008 Gerber 0 0
  222 Gerber South 839 777
Tulare 203 Alpaugh 283 231
  182 Delano 351 269
  086 Lindcove 1006 943
  169 Porterville 1331 1059
Ventura 152 Camarillo 240 239
  217 Moorpark 83 83
  156 Oxnard 0 0
  198 Santa Paula 214 204
Yolo 155 Bryte 610 607
  006 Davis 731 703
  196 Esparto 0 0
  226 Woodland 667 644
Yuba 084 Browns Valley 444 431
Webmaster Email: fruitsandnuts@ucdavis.edu