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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 662 628
  171 Union City 499 481
Amador 227 Plymouth 1077 981
Butte 012 Durham 804 734
Colusa 032 Colusa 551 497
Contra Costa 047 Brentwood 234 232
  170 Concord 1175 878
  213 El Cerrito 128 128
  178 Moraga 882 819
El Dorado 013 Camino 639 619
  228 Diamond Springs 528 516
Fresno 205 Coalinga 586 566
  007 Firebaugh/Telles 614 576
  190 Five Points South West 677 618
  002 FivePoints/WSFS USDA 714 648
  080 Fresno State 666 606
  142 Orange Cove 745 685
  124 Panoche 627 580
  039 Parlier 1105 1019
  105 Westlands 697 636
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 1696 957
  183 Owens Lake North 1454 1159
  189 Owens Lake South 1485 1049
Kern 125 Arvin-Edison 535 478
  146 Belridge 620 575
  054 Blackwells Corner 849 762
  138 Famoso 745 708
  005 Shafter/USDA 1229 854
Kings 021 Kettleman 534 420
  015 Stratford 648 595
Lassen 057 Buntingville 2172 1059
Los Angeles 216 Arleta 157 157
  215 Chatsworth 130 126
  133 Glendale 153 153
  174 Long Beach 249 246
  159 Monrovia 128 125
  197 Palmdale 1221 928
  220 Palmdale Central 889 784
  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 697 643
Marin 187 Black Point 629 610
  157 Point San Pedro 360 355
Mendocino 085 Hopland FS 535 519
  106 Sanel Valley 842 722
Merced 092 Kesterson 1289 1153
  056 Los Banos 729 671
  148 Merced 1086 984
Modoc 090 Alturas 2204 1350
Monterey 114 Arroyo Seco 434 411
  210 Carmel 452 420
  019 Castroville 743 720
  113 King City-Oasis Rd. 678 631
  193 Pacific Grove 65 65
  129 Pajaro 282 275
  116 Salinas North 299 297
  214 Salinas South II 269 265
Napa 109 Carneros 714 685
  077 Oakville 618 601
Orange 075 Irvine 77 77
Placer 195 Auburn 379 362
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 596 537
  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 479 466
  140 Twitchell Island 562 539
San Benito 126 San Benito 538 434
  143 San Juan Valley 623 580
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2218 951
  233 Joshua Tree 806 703
  192 Lake Arrowhead 1687 1141
  117 Victorville 954 828
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 706 671
  070 Manteca 720 663
  167 Tracy 639 604
San Luis Obispo 163 Atascadero 925 719
  202 Nipomo 165 165
  052 San Luis Obispo 168 154
  160 San Luis Obispo West 347 332
Santa Barbara 088 Cuyama 1100 954
  094 Goleta Foothills 1 1
  231 Lompoc 503 470
  107 Santa Barbara 90 86
  230 Santa Barbara II 18 1
  232 Santa Maria II 270 270
  064 Santa Ynez 746 633
  165 Sisquoc 552 276
Santa Clara 211 Gilroy 724 660
Santa Cruz 104 De Laveaga 496 232
  209 Watsonville West II 181 179
Shasta 043 McArthur 2082 1449
  224 Shasta College 754 656
Siskiyou 091 Tulelake FS 2212 1347
Solano 121 Dixon 1348 1251
  212 Hastings Tract East 800 755
  139 Winters 633 590
Sonoma 158 Bennett Valley 1547 720
  144 Petaluma East 1460 1294
  083 Santa Rosa 817 759
  103 Windsor 906 844
Stanislaus 206 Denair 796 643
  071 Modesto 798 734
  194 Oakdale 791 742
  161 Patterson 1164 1039
Sutter 235 Verona 743 701
Tehama 008 Gerber 0 0
  222 Gerber South 601 573
Tulare 203 Alpaugh 1260 1039
  182 Delano 979 850
  086 Lindcove 555 519
  169 Porterville 1295 1149
Ventura 152 Camarillo 135 135
  156 Oxnard 247 247
  198 Santa Paula 426 385
Yolo 155 Bryte 444 435
  006 Davis 535 517
  196 Esparto 323 316
  226 Woodland 505 487
Yuba 084 Browns Valley 333 324
Webmaster Email: fruitsandnuts@ucdavis.edu