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 615 547
  171 Union City 569 523
Amador 227 Plymouth 1187 1008
Butte 012 Durham 770 665
Colusa 032 Colusa 0 0
Contra Costa 047 Brentwood 524 510
  170 Concord 990 806
  213 El Cerrito 406 373
  178 Moraga 731 652
El Dorado 013 Camino 1072 938
  228 Diamond Springs 993 940
Fresno 205 Coalinga 605 565
  007 Firebaugh/Telles 599 549
  190 Five Points South West 545 461
  002 FivePoints/WSFS USDA 628 548
  080 Fresno State 600 545
  142 Orange Cove 630 578
  124 Panoche 687 604
  039 Parlier 625 595
  105 Westlands 574 491
Imperial 041 Calipatria/Mulberry 302 293
  087 Meloland 179 178
  175 Palo Verde II 393 380
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 223 218
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 272 267
Inyo 035 Bishop 1397 812
  183 Owens Lake North 1212 907
  189 Owens Lake South 1160 764
Kern 125 Arvin-Edison 515 488
  146 Belridge 562 519
  054 Blackwells Corner 825 622
  005 Shafter/USDA 656 612
Kings 021 Kettleman 438 389
  015 Stratford 598 537
Lassen 057 Buntingville 1697 737
Los Angeles 216 Arleta 110 110
  215 Chatsworth 88 88
  133 Glendale 0 0
  174 Long Beach 114 114
  159 Monrovia 134 134
  197 Palmdale 937 743
  220 Palmdale Central 783 674
  078 Pomona 200 200
  204 Santa Clarita 254 254
  099 Santa Monica 19 19
  219 West Hills 69 69
Madera 145 Madera 0 0
  188 Madera II 969 816
Marin 187 Black Point 637 571
  157 Point San Pedro 520 499
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 838 663
Merced 092 Kesterson 778 610
  056 Los Banos 646 572
  148 Merced 829 623
Modoc 090 Alturas 1771 714
Monterey 114 Arroyo Seco 496 479
  210 Carmel 460 454
  019 Castroville 343 342
  113 King City-Oasis Rd. 563 518
  193 Pacific Grove 150 150
  129 Pajaro 366 366
  116 Salinas North 461 458
  214 Salinas South II 394 390
Napa 109 Carneros 734 616
  077 Oakville 782 709
Orange 245 Coto de Caza 214 214
  075 Irvine 72 72
  241 San Clemente 174 174
Placer 195 Auburn 707 700
Riverside 135 Blythe NE 345 345
  118 Cathedral City 0 0
  239 Hemet 389 389
  200 Indio 2 154 154
  208 La Quinta II 413 336
  238 Moreno Valley 128 128
  136 Oasis 96 96
  240 Perris 250 250
  151 Ripley 345 340
  062 Temecula 0 0
  237 Temecula East III 284 284
  218 Thermal South 335 331
  044 U.C. Riverside 152 152
  179 Winchester 253 252
Sacramento 131 Fair Oaks 637 597
  140 Twitchell Island 589 576
San Benito 126 San Benito 531 498
  143 San Juan Valley 576 524
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1660 707
  233 Joshua Tree 692 597
  192 Lake Arrowhead 1539 1087
  234 Newberry Springs II 676 576
  117 Victorville 606 497
San Diego 207 Borrego Springs 284 268
  153 Escondido SPV 332 311
  150 Miramar 73 73
  147 Otay Lake 43 43
  184 San Diego II 18 18
  173 Torrey Pines 7 7
San Joaquin 166 Lodi West 0 0
  070 Manteca 668 577
  167 Tracy 588 539
San Luis Obispo 163 Atascadero 521 446
  202 Nipomo 212 212
  052 San Luis Obispo 178 178
  160 San Luis Obispo West 312 312
Santa Barbara 088 Cuyama 844 769
  094 Goleta Foothills 0 0
  231 Lompoc 374 357
  107 Santa Barbara 801 753
  230 Santa Barbara II 11 11
  232 Santa Maria II 319 311
  064 Santa Ynez 603 497
  165 Sisquoc 557 510
Santa Clara 211 Gilroy 509 461
Santa Cruz 104 De Laveaga 898 828
  209 Watsonville West II 342 342
Shasta 043 McArthur 1758 911
  224 Shasta College 935 783
Siskiyou 236 Macdoel II 1780 777
  225 Scott Valley 1701 896
  091 Tulelake FS 1791 769
Solano 121 Dixon 1020 907
  212 Hastings Tract East 897 782
  139 Winters 777 684
Sonoma 158 Bennett Valley 915 759
  144 Petaluma East 1743 1154
  083 Santa Rosa 798 669
  103 Windsor 897 732
Stanislaus 206 Denair 621 568
  071 Modesto 672 590
  194 Oakdale 0 0
  161 Patterson 565 502
Sutter 235 Verona 788 706
Tehama 008 Gerber 0 0
  222 Gerber South 810 748
Tulare 203 Alpaugh 912 723
  182 Delano 719 645
  086 Lindcove 609 592
  169 Porterville 647 594
Ventura 152 Camarillo 183 183
  217 Moorpark 110 110
  156 Oxnard 91 91
  198 Santa Paula 270 253
Yolo 155 Bryte 662 649
  006 Davis 663 632
  196 Esparto 505 502
  226 Woodland 706 431
Yuba 084 Browns Valley 587 580
Webmaster Email: fruitsandnuts@ucdavis.edu