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Fruit & Nut Research and Information Center
Fruit & Nut Research and Information Center
Fruit & Nut Research and Information Center
University of California
Fruit & Nut Research and 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 666 632
  171 Union City 500 482
Amador 227 Plymouth 1095 999
Butte 012 Durham 815 745
Colusa 032 Colusa 561 507
Contra Costa 047 Brentwood 234 232
  170 Concord 1175 878
  213 El Cerrito 132 132
  178 Moraga 891 828
El Dorado 013 Camino 663 643
  228 Diamond Springs 547 535
Fresno 205 Coalinga 588 568
  007 Firebaugh/Telles 622 584
  190 Five Points South West 684 625
  002 FivePoints/WSFS USDA 720 654
  080 Fresno State 667 607
  142 Orange Cove 745 685
  124 Panoche 637 590
  039 Parlier 1105 1019
  105 Westlands 703 642
Imperial 041 Calipatria/Mulberry 480 418
  087 Meloland 277 260
  175 Palo Verde II 638 575
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 321 304
  201 UC-Andrade 502 176
  186 UC-San Luis 11 11
  181 Westmorland North 435 377
Inyo 035 Bishop 1712 964
  183 Owens Lake North 1466 1171
  189 Owens Lake South 1495 1059
Kern 125 Arvin-Edison 535 478
  146 Belridge 623 578
  054 Blackwells Corner 858 771
  138 Famoso 745 708
  005 Shafter/USDA 1229 854
Kings 021 Kettleman 541 427
  015 Stratford 656 603
Lassen 057 Buntingville 2195 1082
Los Angeles 216 Arleta 157 157
  215 Chatsworth 131 127
  133 Glendale 153 153
  174 Long Beach 249 246
  159 Monrovia 128 125
  197 Palmdale 1232 939
  220 Palmdale Central 896 791
  078 Pomona 189 188
  204 Santa Clarita 258 244
  099 Santa Monica 41 41
  219 West Hills 179 158
Madera 145 Madera 0 0
  188 Madera II 707 653
Marin 187 Black Point 633 614
  157 Point San Pedro 362 357
Mendocino 085 Hopland FS 549 533
  106 Sanel Valley 855 735
Merced 092 Kesterson 1298 1162
  056 Los Banos 734 676
  148 Merced 1099 997
Modoc 090 Alturas 2228 1363
Monterey 114 Arroyo Seco 434 411
  210 Carmel 456 424
  019 Castroville 746 723
  113 King City-Oasis Rd. 681 634
  193 Pacific Grove 65 65
  129 Pajaro 288 281
  116 Salinas North 302 300
  214 Salinas South II 272 268
Napa 109 Carneros 724 695
  077 Oakville 629 612
Orange 075 Irvine 77 77
Placer 195 Auburn 380 363
Riverside 135 Blythe NE 508 452
  118 Cathedral City 0 0
  200 Indio 2 236 204
  208 La Quinta II 365 346
  238 Moreno Valley 234 222
  136 Oasis 162 104
  240 Perris 613 568
  151 Ripley 598 539
  062 Temecula 107 97
  237 Temecula East III 194 185
  218 Thermal South 419 369
  044 U.C. Riverside 161 152
  179 Winchester 630 592
Sacramento 131 Fair Oaks 480 467
  140 Twitchell Island 563 540
San Benito 126 San Benito 545 441
  143 San Juan Valley 629 586
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2242 951
  233 Joshua Tree 806 703
  192 Lake Arrowhead 1718 1172
  117 Victorville 958 832
San Diego 207 Borrego Springs 430 392
  153 Escondido SPV 1127 383
  173 La Jolla 92 92
  150 Miramar 93 93
  147 Otay Lake 91 87
  184 San Diego II 45 45
San Joaquin 166 Lodi West 708 673
  070 Manteca 723 666
  167 Tracy 639 604
San Luis Obispo 163 Atascadero 937 731
  202 Nipomo 165 165
  052 San Luis Obispo 169 155
  160 San Luis Obispo West 359 344
Santa Barbara 088 Cuyama 1114 968
  094 Goleta Foothills 1 1
  231 Lompoc 505 472
  107 Santa Barbara 90 86
  230 Santa Barbara II 18 1
  232 Santa Maria II 270 270
  064 Santa Ynez 752 639
  165 Sisquoc 557 281
Santa Clara 211 Gilroy 730 666
Santa Cruz 104 De Laveaga 507 243
  209 Watsonville West II 183 181
Shasta 043 McArthur 2103 1468
  224 Shasta College 762 664
Siskiyou 091 Tulelake FS 2236 1357
Solano 121 Dixon 1358 1261
  212 Hastings Tract East 805 760
  139 Winters 636 593
Sonoma 158 Bennett Valley 1595 720
  144 Petaluma East 1473 1307
  083 Santa Rosa 829 771
  103 Windsor 918 856
Stanislaus 206 Denair 799 646
  071 Modesto 802 738
  194 Oakdale 795 746
  161 Patterson 1169 1044
Sutter 235 Verona 750 708
Tehama 008 Gerber 0 0
  222 Gerber South 609 581
Tulare 203 Alpaugh 1269 1048
  182 Delano 983 854
  086 Lindcove 555 519
  169 Porterville 1302 1156
Ventura 152 Camarillo 136 136
  156 Oxnard 248 248
  198 Santa Paula 428 387
Yolo 155 Bryte 444 435
  006 Davis 537 519
  196 Esparto 323 316
  226 Woodland 505 487
Yuba 084 Browns Valley 335 326
Webmaster Email: fruitsandnuts@ucdavis.edu