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 603 535
  171 Union City 533 487
Amador 227 Plymouth 1163 988
Butte 012 Durham 760 655
Colusa 032 Colusa 0 0
Contra Costa 047 Brentwood 519 505
  170 Concord 947 763
  213 El Cerrito 444 403
  178 Moraga 714 635
El Dorado 013 Camino 1047 932
  228 Diamond Springs 969 916
Fresno 205 Coalinga 661 621
  007 Firebaugh/Telles 575 525
  190 Five Points South West 525 441
  002 FivePoints/WSFS USDA 616 536
  080 Fresno State 575 520
  142 Orange Cove 621 569
  124 Panoche 669 586
  039 Parlier 603 573
  105 Westlands 553 470
Imperial 041 Calipatria/Mulberry 302 293
  087 Meloland 179 178
  175 Palo Verde II 392 379
  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 1373 798
  183 Owens Lake North 1188 885
  189 Owens Lake South 1139 745
Kern 125 Arvin-Edison 508 481
  146 Belridge 549 506
  054 Blackwells Corner 779 569
  005 Shafter/USDA 647 603
Kings 021 Kettleman 438 389
  015 Stratford 607 546
Lassen 057 Buntingville 1649 711
Los Angeles 216 Arleta 110 110
  215 Chatsworth 88 88
  133 Glendale 0 0
  174 Long Beach 112 112
  159 Monrovia 127 127
  197 Palmdale 913 719
  220 Palmdale Central 759 650
  078 Pomona 200 200
  204 Santa Clarita 243 243
  099 Santa Monica 17 17
  219 West Hills 69 69
Madera 145 Madera 0 0
  188 Madera II 951 798
Marin 187 Black Point 622 556
  157 Point San Pedro 505 484
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 812 637
Merced 092 Kesterson 762 594
  056 Los Banos 630 556
  148 Merced 813 607
Modoc 090 Alturas 1723 694
Monterey 114 Arroyo Seco 477 460
  210 Carmel 448 442
  019 Castroville 341 340
  113 King City-Oasis Rd. 533 488
  193 Pacific Grove 150 150
  129 Pajaro 354 354
  116 Salinas North 456 453
  214 Salinas South II 385 381
Napa 109 Carneros 743 618
  077 Oakville 761 688
Orange 245 Coto de Caza 209 209
  075 Irvine 71 71
  241 San Clemente 171 171
Placer 195 Auburn 670 663
Riverside 135 Blythe NE 344 344
  118 Cathedral City 0 0
  239 Hemet 376 376
  200 Indio 2 154 154
  208 La Quinta II 403 333
  238 Moreno Valley 117 117
  136 Oasis 96 96
  240 Perris 235 235
  151 Ripley 344 339
  062 Temecula 0 0
  237 Temecula East III 274 274
  218 Thermal South 333 329
  044 U.C. Riverside 150 150
  179 Winchester 253 252
Sacramento 131 Fair Oaks 614 574
  140 Twitchell Island 577 564
San Benito 126 San Benito 512 479
  143 San Juan Valley 625 573
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1612 725
  233 Joshua Tree 682 587
  192 Lake Arrowhead 1515 1081
  234 Newberry Springs II 663 563
  117 Victorville 606 497
San Diego 207 Borrego Springs 283 267
  153 Escondido SPV 328 307
  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 647 556
  167 Tracy 638 589
San Luis Obispo 163 Atascadero 504 429
  202 Nipomo 206 206
  052 San Luis Obispo 170 170
  160 San Luis Obispo West 303 303
Santa Barbara 088 Cuyama 818 743
  094 Goleta Foothills 0 0
  231 Lompoc 395 378
  107 Santa Barbara 783 735
  230 Santa Barbara II 11 11
  232 Santa Maria II 311 303
  064 Santa Ynez 603 497
  165 Sisquoc 551 504
Santa Clara 211 Gilroy 490 442
Santa Cruz 104 De Laveaga 837 781
  209 Watsonville West II 328 328
Shasta 043 McArthur 1710 884
  224 Shasta College 886 734
Siskiyou 236 Macdoel II 1756 776
  225 Scott Valley 1677 886
  091 Tulelake FS 1743 758
Solano 121 Dixon 1013 900
  212 Hastings Tract East 880 765
  139 Winters 752 659
Sonoma 158 Bennett Valley 894 738
  144 Petaluma East 1719 1146
  083 Santa Rosa 772 643
  103 Windsor 895 730
Stanislaus 206 Denair 598 545
  071 Modesto 650 568
  194 Oakdale 0 0
  161 Patterson 616 553
Sutter 235 Verona 773 691
Tehama 008 Gerber 0 0
  222 Gerber South 795 733
Tulare 203 Alpaugh 883 694
  182 Delano 702 628
  086 Lindcove 591 574
  169 Porterville 628 575
Ventura 152 Camarillo 176 176
  217 Moorpark 104 104
  156 Oxnard 91 91
  198 Santa Paula 260 243
Yolo 155 Bryte 643 630
  006 Davis 647 616
  196 Esparto 491 488
  226 Woodland 688 413
Yuba 084 Browns Valley 565 558
Webmaster Email: fruitsandnuts@ucdavis.edu