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 776 710
  171 Union City 970 946
Amador 227 Plymouth 1049 1007
Butte 012 Durham 852 783
Colusa 250 Williams 799 747
Contra Costa 047 Brentwood 621 599
  170 Concord 870 828
  213 El Cerrito 481 329
  178 Moraga 913 805
El Dorado 013 Camino 678 655
  228 Diamond Springs 628 616
Fresno 205 Coalinga 817 786
  007 Firebaugh/Telles 713 651
  190 Five Points South West 823 721
  002 FivePoints/WSFS USDA 875 759
  080 Fresno State 802 753
  142 Orange Cove 825 771
  124 Panoche 891 783
  039 Parlier 849 800
  105 Westlands 877 756
Imperial 041 Calipatria/Mulberry 465 453
  087 Meloland 255 255
  175 Palo Verde II 680 598
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 348 347
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 299 298
Inyo 035 Bishop 1603 869
  183 Owens Lake North 1424 1028
  189 Owens Lake South 1486 917
Kern 125 Arvin-Edison 740 711
  146 Belridge 781 731
  054 Blackwells Corner 1029 879
  005 Shafter/USDA 900 767
Kings 021 Kettleman 0 0
  015 Stratford 846 750
Lassen 057 Buntingville 2091 964
Los Angeles 216 Arleta 76 76
  215 Chatsworth 34 34
  133 Glendale 0 0
  174 Long Beach 217 217
  159 Monrovia 77 77
  197 Palmdale 1109 786
  220 Palmdale Central 841 714
  078 Pomona 209 207
  204 Santa Clarita 161 161
  099 Santa Monica 3 3
  219 West Hills 97 97
Madera 145 Madera 0 0
  188 Madera II 1351 1077
Marin 187 Black Point 890 778
  157 Point San Pedro 610 602
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1052 820
Merced 092 Kesterson 1062 849
  056 Los Banos 825 705
  148 Merced 1099 829
Modoc 090 Alturas 2135 1036
Monterey 114 Arroyo Seco 657 629
  210 Carmel 415 415
  019 Castroville 741 636
  113 King City-Oasis Rd. 742 683
  193 Pacific Grove 100 100
  129 Pajaro 354 353
  116 Salinas North 394 392
  214 Salinas South II 341 341
Napa 109 Carneros 972 826
  077 Oakville 883 857
Orange 245 Coto de Caza 181 181
  075 Irvine 68 68
  241 San Clemente 207 207
Placer 195 Auburn 510 497
Riverside 135 Blythe NE 479 465
  118 Cathedral City 0 0
  239 Hemet 308 301
  200 Indio 2 171 171
  208 La Quinta II 301 279
  238 Moreno Valley 73 73
  136 Oasis 74 74
  240 Perris 402 385
  151 Ripley 553 525
  062 Temecula 39 30
  237 Temecula East III 74 74
  218 Thermal South 360 360
  044 U.C. Riverside 109 109
  179 Winchester 504 486
Sacramento 131 Fair Oaks 668 663
  140 Twitchell Island 638 616
San Benito 126 San Benito 678 660
  143 San Juan Valley 679 651
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1839 937
  233 Joshua Tree 830 766
  192 Lake Arrowhead 1580 977
  234 Newberry Springs II 839 752
  117 Victorville 35 35
San Diego 207 Borrego Springs 397 385
  153 Escondido SPV 612 567
  150 Miramar 120 120
  147 Otay Lake 180 180
  184 San Diego II 14 14
  173 Torrey Pines 4 4
San Joaquin 166 Lodi West 0 0
  070 Manteca 920 811
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 1040 758
  202 Nipomo 144 144
  052 San Luis Obispo 145 145
  160 San Luis Obispo West 275 275
Santa Barbara 088 Cuyama 1095 914
  094 Goleta Foothills 0 0
  231 Lompoc 702 670
  107 Santa Barbara 81 81
  230 Santa Barbara II 10 10
  232 Santa Maria II 331 331
  064 Santa Ynez 771 597
  165 Sisquoc 782 685
Santa Clara 211 Gilroy 759 673
Santa Cruz 104 De Laveaga 356 356
  209 Watsonville West II 267 267
Shasta 043 McArthur 2121 1262
  224 Shasta College 868 738
Siskiyou 236 Macdoel II 2206 975
  225 Scott Valley 2098 1159
  091 Tulelake FS 2215 1031
Solano 121 Dixon 1252 814
  212 Hastings Tract East 1586 1142
  139 Winters 816 751
Sonoma 158 Bennett Valley 1031 981
  144 Petaluma East 2125 1327
  083 Santa Rosa 1060 877
  103 Windsor 966 852
Stanislaus 206 Denair 827 769
  071 Modesto 837 699
  194 Oakdale 853 827
  161 Patterson 227 189
Sutter 235 Verona 837 755
Tehama 008 Gerber 0 0
  222 Gerber South 807 762
Tulare 203 Alpaugh 283 231
  182 Delano 321 251
  086 Lindcove 976 925
  169 Porterville 1300 1042
Ventura 152 Camarillo 216 216
  217 Moorpark 53 53
  156 Oxnard 0 0
  198 Santa Paula 189 179
Yolo 155 Bryte 579 579
  006 Davis 702 679
  196 Esparto 0 0
  226 Woodland 637 616
Yuba 084 Browns Valley 411 402
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