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 747 681
  171 Union City 926 904
Amador 227 Plymouth 999 968
Butte 012 Durham 822 761
Colusa 250 Williams 761 715
Contra Costa 047 Brentwood 601 579
  170 Concord 844 802
  213 El Cerrito 456 304
  178 Moraga 881 777
El Dorado 013 Camino 628 624
  228 Diamond Springs 580 580
Fresno 205 Coalinga 789 758
  007 Firebaugh/Telles 680 618
  190 Five Points South West 789 688
  002 FivePoints/WSFS USDA 840 725
  080 Fresno State 768 719
  142 Orange Cove 793 741
  124 Panoche 855 747
  039 Parlier 816 768
  105 Westlands 842 723
Imperial 041 Calipatria/Mulberry 448 436
  087 Meloland 249 249
  175 Palo Verde II 660 578
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 335 334
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 287 286
Inyo 035 Bishop 1554 849
  183 Owens Lake North 1376 991
  189 Owens Lake South 1439 892
Kern 125 Arvin-Edison 713 684
  146 Belridge 753 703
  054 Blackwells Corner 1001 851
  005 Shafter/USDA 872 739
Kings 021 Kettleman 0 0
  015 Stratford 813 717
Lassen 057 Buntingville 2039 946
Los Angeles 216 Arleta 71 71
  215 Chatsworth 22 22
  133 Glendale 0 0
  174 Long Beach 216 216
  159 Monrovia 77 77
  197 Palmdale 1074 762
  220 Palmdale Central 809 683
  078 Pomona 202 200
  204 Santa Clarita 136 136
  099 Santa Monica 3 3
  219 West Hills 83 83
Madera 145 Madera 0 0
  188 Madera II 1316 1047
Marin 187 Black Point 861 750
  157 Point San Pedro 584 576
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1016 797
Merced 092 Kesterson 1023 817
  056 Los Banos 789 669
  148 Merced 1060 804
Modoc 090 Alturas 2070 1019
Monterey 114 Arroyo Seco 628 600
  210 Carmel 407 407
  019 Castroville 723 618
  113 King City-Oasis Rd. 709 651
  193 Pacific Grove 98 98
  129 Pajaro 332 331
  116 Salinas North 370 368
  214 Salinas South II 320 320
Napa 109 Carneros 933 794
  077 Oakville 843 822
Orange 245 Coto de Caza 174 174
  075 Irvine 65 65
  241 San Clemente 195 195
Placer 195 Auburn 478 473
Riverside 135 Blythe NE 464 450
  118 Cathedral City 0 0
  239 Hemet 286 281
  200 Indio 2 163 163
  208 La Quinta II 285 266
  238 Moreno Valley 60 60
  136 Oasis 74 74
  240 Perris 382 365
  151 Ripley 533 505
  062 Temecula 34 25
  237 Temecula East III 74 74
  218 Thermal South 342 342
  044 U.C. Riverside 102 102
  179 Winchester 482 465
Sacramento 131 Fair Oaks 642 642
  140 Twitchell Island 612 590
San Benito 126 San Benito 645 627
  143 San Juan Valley 651 626
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1780 927
  233 Joshua Tree 802 740
  192 Lake Arrowhead 1522 946
  234 Newberry Springs II 811 724
  117 Victorville 35 35
San Diego 207 Borrego Springs 381 369
  153 Escondido SPV 596 551
  150 Miramar 120 120
  147 Otay Lake 178 178
  184 San Diego II 14 14
  173 Torrey Pines 4 4
San Joaquin 166 Lodi West 0 0
  070 Manteca 888 779
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 997 733
  202 Nipomo 124 124
  052 San Luis Obispo 125 125
  160 San Luis Obispo West 248 248
Santa Barbara 088 Cuyama 1046 869
  094 Goleta Foothills 0 0
  231 Lompoc 678 646
  107 Santa Barbara 77 77
  230 Santa Barbara II 10 10
  232 Santa Maria II 302 302
  064 Santa Ynez 739 570
  165 Sisquoc 756 661
Santa Clara 211 Gilroy 727 641
Santa Cruz 104 De Laveaga 326 326
  209 Watsonville West II 246 246
Shasta 043 McArthur 2061 1234
  224 Shasta College 834 714
Siskiyou 236 Macdoel II 2143 964
  225 Scott Valley 2037 1132
  091 Tulelake FS 2157 1015
Solano 121 Dixon 1219 787
  212 Hastings Tract East 1556 1120
  139 Winters 787 722
Sonoma 158 Bennett Valley 989 948
  144 Petaluma East 2059 1295
  083 Santa Rosa 1016 846
  103 Windsor 926 818
Stanislaus 206 Denair 792 735
  071 Modesto 800 662
  194 Oakdale 817 795
  161 Patterson 227 189
Sutter 235 Verona 809 734
Tehama 008 Gerber 0 0
  222 Gerber South 775 735
Tulare 203 Alpaugh 283 231
  182 Delano 289 220
  086 Lindcove 941 893
  169 Porterville 1267 1013
Ventura 152 Camarillo 201 201
  217 Moorpark 48 48
  156 Oxnard 0 0
  198 Santa Paula 179 169
Yolo 155 Bryte 558 558
  006 Davis 675 653
  196 Esparto 0 0
  226 Woodland 611 590
Yuba 084 Browns Valley 388 388
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