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 762 718
  171 Union City 793 774
Amador 227 Plymouth 1147 1076
Butte 244 Biggs 745 735
  012 Durham 897 820
Colusa 250 Williams 820 780
Contra Costa 047 Brentwood 610 598
  170 Concord 901 834
  213 El Cerrito 223 223
  178 Moraga 850 746
El Dorado 013 Camino 1005 921
  228 Diamond Springs 866 823
Fresno 205 Coalinga 551 545
  007 Firebaugh/Telles 643 620
  190 Five Points South West 737 662
  002 FivePoints/WSFS USDA 768 691
  080 Fresno State 735 667
  142 Orange Cove 751 692
  124 Panoche 724 680
  039 Parlier 730 682
  105 Westlands 885 794
Imperial 041 Calipatria/Mulberry 537 504
  087 Meloland 380 350
  175 Palo Verde II 880 756
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 415 414
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 416 397
Inyo 035 Bishop 1956 1020
  183 Owens Lake North 1607 1215
  189 Owens Lake South 1657 1053
Kern 125 Arvin-Edison 663 602
  146 Belridge 735 672
  054 Blackwells Corner 788 727
  005 Shafter/USDA 722 659
Kings 021 Kettleman 0 0
  015 Stratford 731 678
Lassen 057 Buntingville 2247 1002
Los Angeles 216 Arleta 207 207
  215 Chatsworth 133 133
  133 Glendale 0 0
  174 Long Beach 123 123
  159 Monrovia 331 259
  197 Palmdale 1239 957
  220 Palmdale Central 1127 1005
  078 Pomona 318 312
  204 Santa Clarita 372 368
  099 Santa Monica 23 23
  219 West Hills 233 233
Madera 145 Madera 0 0
  188 Madera II 0 0
Marin 187 Black Point 672 601
  157 Point San Pedro 553 541
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 0 0
Merced 092 Kesterson 1010 858
  056 Los Banos 732 675
  148 Merced 1073 806
Modoc 090 Alturas 2288 1147
Monterey 114 Arroyo Seco 622 592
  210 Carmel 474 470
  019 Castroville 404 401
  113 King City-Oasis Rd. 775 707
  193 Pacific Grove 104 104
  129 Pajaro 530 509
  116 Salinas North 354 354
  214 Salinas South II 354 351
Napa 109 Carneros 811 700
  077 Oakville 816 762
Orange 245 Coto de Caza 297 296
  075 Irvine 91 91
  241 San Clemente 263 263
Placer 195 Auburn 1727 310
Riverside 135 Blythe NE 654 635
  118 Cathedral City 0 0
  239 Hemet 499 476
  200 Indio 2 252 246
  208 La Quinta II 215 215
  238 Moreno Valley 0 0
  136 Oasis 165 165
  240 Perris 590 548
  151 Ripley 700 661
  062 Temecula 141 141
  237 Temecula East III 293 292
  218 Thermal South 506 482
  044 U.C. Riverside 160 160
  179 Winchester 701 640
Sacramento 131 Fair Oaks 672 667
  140 Twitchell Island 658 648
San Benito 126 San Benito 661 618
  143 San Juan Valley 767 707
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1882 1025
  233 Joshua Tree 1033 917
  192 Lake Arrowhead 2011 1227
  234 Newberry Springs II 1002 907
  117 Victorville 1117 996
San Diego 207 Borrego Springs 537 509
  153 Escondido SPV 301 287
  150 Miramar 149 149
  147 Otay Lake 150 150
  184 San Diego II 107 60
  173 Torrey Pines 132 60
San Joaquin 166 Lodi West 0 0
  070 Manteca 814 710
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 893 724
  202 Nipomo 153 153
  052 San Luis Obispo 225 225
  160 San Luis Obispo West 336 335
Santa Barbara 088 Cuyama 1112 943
  094 Goleta Foothills 0 0
  231 Lompoc 489 459
  107 Santa Barbara 109 109
  230 Santa Barbara II 0 0
  232 Santa Maria II 275 274
  064 Santa Ynez 723 617
  165 Sisquoc 446 436
Santa Clara 211 Gilroy 616 565
Santa Cruz 104 De Laveaga 381 381
  209 Watsonville West II 268 268
Shasta 043 McArthur 2255 1327
  224 Shasta College 953 780
Siskiyou 236 Macdoel II 2279 1034
  225 Scott Valley 2080 1113
  091 Tulelake FS 2314 1123
Solano 121 Dixon 820 767
  212 Hastings Tract East 873 790
  139 Winters 748 685
Sonoma 158 Bennett Valley 899 825
  144 Petaluma East 806 728
  083 Santa Rosa 918 763
  103 Windsor 876 753
Stanislaus 206 Denair 744 702
  071 Modesto 829 736
  194 Oakdale 816 767
  161 Patterson 0 0
Sutter 235 Verona 853 780
Tehama 008 Gerber 0 0
  222 Gerber South 896 843
Tulare 203 Alpaugh 0 0
  182 Delano 613 570
  086 Lindcove 1042 960
  169 Porterville 1478 1223
Ventura 152 Camarillo 227 227
  217 Moorpark 132 132
  156 Oxnard 0 0
  198 Santa Paula 300 298
Yolo 155 Bryte 637 637
  006 Davis 666 656
  196 Esparto 0 0
  226 Woodland 662 651
Yuba 084 Browns Valley 513 513
Webmaster Email: fruitsandnuts@ucdavis.edu