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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 548 516
  171 Union City 421 403
Amador 227 Plymouth 910 814
Butte 012 Durham 638 569
Colusa 032 Colusa 427 395
Contra Costa 047 Brentwood 232 230
  170 Concord 1141 844
  213 El Cerrito 128 128
  178 Moraga 716 660
El Dorado 013 Camino 576 556
  228 Diamond Springs 467 455
Fresno 205 Coalinga 491 471
  007 Firebaugh/Telles 508 470
  190 Five Points South West 545 486
  002 FivePoints/WSFS USDA 599 533
  080 Fresno State 550 490
  142 Orange Cove 616 556
  124 Panoche 522 475
  039 Parlier 1031 945
  105 Westlands 541 485
Imperial 041 Calipatria/Mulberry 427 365
  087 Meloland 267 250
  175 Palo Verde II 548 485
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 310 293
  201 UC-Andrade 447 169
  186 UC-San Luis 11 11
  181 Westmorland North 383 325
Inyo 035 Bishop 1382 743
  183 Owens Lake North 1220 937
  189 Owens Lake South 1204 814
Kern 125 Arvin-Edison 491 434
  146 Belridge 544 499
  054 Blackwells Corner 720 633
  138 Famoso 674 637
  005 Shafter/USDA 1147 772
Kings 021 Kettleman 498 385
  015 Stratford 542 489
Lassen 057 Buntingville 1783 804
Los Angeles 216 Arleta 142 142
  215 Chatsworth 130 126
  133 Glendale 153 153
  174 Long Beach 248 245
  159 Monrovia 116 114
  197 Palmdale 1009 742
  220 Palmdale Central 759 654
  078 Pomona 179 178
  204 Santa Clarita 219 205
  099 Santa Monica 41 41
  219 West Hills 160 146
Madera 145 Madera 0 0
  188 Madera II 563 509
Marin 187 Black Point 513 494
  157 Point San Pedro 296 291
Mendocino 085 Hopland FS 454 438
  106 Sanel Valley 668 563
Merced 092 Kesterson 1044 918
  056 Los Banos 594 536
  148 Merced 874 777
Modoc 090 Alturas 1774 1089
Monterey 114 Arroyo Seco 376 353
  210 Carmel 371 341
  019 Castroville 695 674
  113 King City-Oasis Rd. 542 496
  193 Pacific Grove 61 61
  129 Pajaro 233 226
  116 Salinas North 251 251
  214 Salinas South II 226 225
Napa 109 Carneros 599 570
  077 Oakville 523 506
Orange 075 Irvine 76 76
Placer 195 Auburn 340 323
Riverside 135 Blythe NE 459 403
  118 Cathedral City 0 0
  200 Indio 2 235 203
  208 La Quinta II 365 346
  238 Moreno Valley 204 192
  136 Oasis 162 104
  240 Perris 498 453
  151 Ripley 513 454
  062 Temecula 106 96
  237 Temecula East III 178 171
  218 Thermal South 394 344
  044 U.C. Riverside 147 138
  179 Winchester 493 455
Sacramento 131 Fair Oaks 427 414
  140 Twitchell Island 489 466
San Benito 126 San Benito 450 346
  143 San Juan Valley 510 470
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1784 789
  233 Joshua Tree 695 592
  192 Lake Arrowhead 1457 934
  117 Victorville 802 677
San Diego 207 Borrego Springs 399 361
  153 Escondido SPV 391 381
  173 La Jolla 52 52
  150 Miramar 90 90
  147 Otay Lake 87 84
  184 San Diego II 45 45
San Joaquin 166 Lodi West 602 567
  070 Manteca 584 529
  167 Tracy 525 490
San Luis Obispo 163 Atascadero 745 546
  202 Nipomo 162 162
  052 San Luis Obispo 150 136
  160 San Luis Obispo West 265 250
Santa Barbara 088 Cuyama 883 739
  094 Goleta Foothills 1 1
  231 Lompoc 418 385
  107 Santa Barbara 87 83
  230 Santa Barbara II 14 0
  232 Santa Maria II 236 236
  064 Santa Ynez 598 492
  165 Sisquoc 490 214
Santa Clara 211 Gilroy 601 542
Santa Cruz 104 De Laveaga 440 176
  209 Watsonville West II 165 163
Shasta 043 McArthur 1703 1150
  224 Shasta College 608 513
Siskiyou 091 Tulelake FS 1747 1086
Solano 121 Dixon 1112 1015
  212 Hastings Tract East 656 611
  139 Winters 557 514
Sonoma 158 Bennett Valley 839 804
  144 Petaluma East 1207 1048
  083 Santa Rosa 665 613
  103 Windsor 762 705
Stanislaus 206 Denair 690 537
  071 Modesto 637 575
  194 Oakdale 636 587
  161 Patterson 1093 968
Sutter 235 Verona 615 573
Tehama 008 Gerber 0 0
  222 Gerber South 504 476
Tulare 203 Alpaugh 1036 815
  182 Delano 812 683
  086 Lindcove 482 446
  169 Porterville 1017 876
Ventura 152 Camarillo 118 118
  156 Oxnard 158 158
  198 Santa Paula 389 348
Yolo 155 Bryte 407 398
  006 Davis 462 444
  196 Esparto 302 295
  226 Woodland 455 437
Yuba 084 Browns Valley 306 297
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