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 791 742
  171 Union City 822 798
Amador 227 Plymouth 1191 1103
Butte 244 Biggs 773 763
  012 Durham 927 850
Colusa 250 Williams 850 810
Contra Costa 047 Brentwood 637 625
  170 Concord 937 859
  213 El Cerrito 252 252
  178 Moraga 882 770
El Dorado 013 Camino 1053 947
  228 Diamond Springs 909 857
Fresno 205 Coalinga 583 577
  007 Firebaugh/Telles 673 650
  190 Five Points South West 768 693
  002 FivePoints/WSFS USDA 800 723
  080 Fresno State 770 698
  142 Orange Cove 788 721
  124 Panoche 756 712
  039 Parlier 766 717
  105 Westlands 918 825
Imperial 041 Calipatria/Mulberry 546 513
  087 Meloland 384 354
  175 Palo Verde II 902 778
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 420 419
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 421 402
Inyo 035 Bishop 2004 1040
  183 Owens Lake North 1655 1246
  189 Owens Lake South 1705 1082
Kern 125 Arvin-Edison 693 632
  146 Belridge 753 690
  054 Blackwells Corner 825 764
  005 Shafter/USDA 754 691
Kings 021 Kettleman 0 0
  015 Stratford 763 710
Lassen 057 Buntingville 2295 1007
Los Angeles 216 Arleta 230 230
  215 Chatsworth 164 164
  133 Glendale 0 0
  174 Long Beach 128 128
  159 Monrovia 344 272
  197 Palmdale 1279 992
  220 Palmdale Central 1169 1046
  078 Pomona 340 334
  204 Santa Clarita 403 399
  099 Santa Monica 28 28
  219 West Hills 252 252
Madera 145 Madera 0 0
  188 Madera II 0 0
Marin 187 Black Point 690 619
  157 Point San Pedro 574 562
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 0 0
Merced 092 Kesterson 1038 886
  056 Los Banos 763 706
  148 Merced 1110 835
Modoc 090 Alturas 2336 1147
Monterey 114 Arroyo Seco 653 623
  210 Carmel 497 493
  019 Castroville 427 424
  113 King City-Oasis Rd. 808 735
  193 Pacific Grove 108 108
  129 Pajaro 554 533
  116 Salinas North 375 375
  214 Salinas South II 380 377
Napa 109 Carneros 839 728
  077 Oakville 846 792
Orange 245 Coto de Caza 317 316
  075 Irvine 108 108
  241 San Clemente 278 278
Placer 195 Auburn 1763 346
Riverside 135 Blythe NE 670 651
  118 Cathedral City 0 0
  239 Hemet 531 508
  200 Indio 2 259 253
  208 La Quinta II 219 219
  238 Moreno Valley 0 0
  136 Oasis 169 169
  240 Perris 624 582
  151 Ripley 716 677
  062 Temecula 167 167
  237 Temecula East III 323 322
  218 Thermal South 512 488
  044 U.C. Riverside 179 179
  179 Winchester 732 670
Sacramento 131 Fair Oaks 702 693
  140 Twitchell Island 686 676
San Benito 126 San Benito 692 646
  143 San Juan Valley 796 733
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1922 1065
  233 Joshua Tree 1066 949
  192 Lake Arrowhead 2059 1227
  234 Newberry Springs II 1039 944
  117 Victorville 1162 1038
San Diego 207 Borrego Springs 545 517
  153 Escondido SPV 312 298
  150 Miramar 158 158
  147 Otay Lake 160 160
  184 San Diego II 110 63
  173 Torrey Pines 132 60
San Joaquin 166 Lodi West 0 0
  070 Manteca 844 740
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 924 745
  202 Nipomo 173 173
  052 San Luis Obispo 253 253
  160 San Luis Obispo West 363 362
Santa Barbara 088 Cuyama 1159 983
  094 Goleta Foothills 0 0
  231 Lompoc 509 479
  107 Santa Barbara 113 113
  230 Santa Barbara II 0 0
  232 Santa Maria II 298 297
  064 Santa Ynez 750 643
  165 Sisquoc 474 463
Santa Clara 211 Gilroy 646 594
Santa Cruz 104 De Laveaga 410 410
  209 Watsonville West II 293 293
Shasta 043 McArthur 2303 1340
  224 Shasta College 985 803
Siskiyou 236 Macdoel II 2327 1043
  225 Scott Valley 2128 1122
  091 Tulelake FS 2362 1127
Solano 121 Dixon 849 796
  212 Hastings Tract East 904 821
  139 Winters 777 714
Sonoma 158 Bennett Valley 930 848
  144 Petaluma East 838 759
  083 Santa Rosa 949 789
  103 Windsor 905 778
Stanislaus 206 Denair 779 734
  071 Modesto 861 768
  194 Oakdale 852 798
  161 Patterson 0 0
Sutter 235 Verona 882 809
Tehama 008 Gerber 0 0
  222 Gerber South 927 874
Tulare 203 Alpaugh 0 0
  182 Delano 613 570
  086 Lindcove 1085 996
  169 Porterville 1526 1255
Ventura 152 Camarillo 248 248
  217 Moorpark 156 156
  156 Oxnard 0 0
  198 Santa Paula 315 313
Yolo 155 Bryte 668 668
  006 Davis 695 685
  196 Esparto 0 0
  226 Woodland 687 676
Yuba 084 Browns Valley 547 544
Webmaster Email: fruitsandnuts@ucdavis.edu