Fruit & Nut Research & Information Center
Fruit & Nut Research & Information Center
Fruit & Nut Research & Information Center
University of California
Fruit & Nut Research & 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 538 505
  171 Union City 603 588
Amador 227 Plymouth 751 732
Butte 244 Biggs 536 526
  012 Durham 638 574
Colusa 250 Williams 578 540
Contra Costa 047 Brentwood 425 413
  170 Concord 575 538
  213 El Cerrito 67 67
  178 Moraga 583 507
El Dorado 013 Camino 599 599
  228 Diamond Springs 515 514
Fresno 205 Coalinga 372 366
  007 Firebaugh/Telles 432 426
  190 Five Points South West 519 464
  002 FivePoints/WSFS USDA 551 496
  080 Fresno State 506 465
  142 Orange Cove 503 470
  124 Panoche 525 488
  039 Parlier 517 485
  105 Westlands 615 566
Imperial 041 Calipatria/Mulberry 397 375
  087 Meloland 283 253
  175 Palo Verde II 626 513
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 310 310
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 304 287
Inyo 035 Bishop 1403 645
  183 Owens Lake North 1161 842
  189 Owens Lake South 1200 723
Kern 125 Arvin-Edison 449 404
  146 Belridge 537 486
  054 Blackwells Corner 564 518
  005 Shafter/USDA 525 470
Kings 021 Kettleman 0 0
  015 Stratford 506 465
Lassen 057 Buntingville 1554 672
Los Angeles 216 Arleta 117 117
  215 Chatsworth 37 37
  133 Glendale 0 0
  174 Long Beach 61 61
  159 Monrovia 210 138
  197 Palmdale 899 696
  220 Palmdale Central 767 694
  078 Pomona 181 175
  204 Santa Clarita 241 241
  099 Santa Monica 4 4
  219 West Hills 123 123
Madera 145 Madera 0 0
  188 Madera II 0 0
Marin 187 Black Point 490 419
  157 Point San Pedro 383 375
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 0 0
Merced 092 Kesterson 741 634
  056 Los Banos 526 478
  148 Merced 768 567
Modoc 090 Alturas 1602 851
Monterey 114 Arroyo Seco 436 408
  210 Carmel 314 310
  019 Castroville 303 300
  113 King City-Oasis Rd. 540 495
  193 Pacific Grove 55 55
  129 Pajaro 403 383
  116 Salinas North 239 239
  214 Salinas South II 209 206
Napa 109 Carneros 568 475
  077 Oakville 555 521
Orange 245 Coto de Caza 180 180
  075 Irvine 26 26
  241 San Clemente 155 155
Placer 195 Auburn 1461 45
Riverside 135 Blythe NE 525 512
  118 Cathedral City 0 0
  239 Hemet 316 298
  200 Indio 2 185 179
  208 La Quinta II 162 162
  238 Moreno Valley 0 0
  136 Oasis 114 114
  240 Perris 390 356
  151 Ripley 526 501
  062 Temecula 57 57
  237 Temecula East III 160 159
  218 Thermal South 388 371
  044 U.C. Riverside 92 92
  179 Winchester 477 432
Sacramento 131 Fair Oaks 450 450
  140 Twitchell Island 461 451
San Benito 126 San Benito 456 427
  143 San Juan Valley 546 507
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1417 709
  233 Joshua Tree 772 697
  192 Lake Arrowhead 1387 830
  234 Newberry Springs II 720 660
  117 Victorville 771 701
San Diego 207 Borrego Springs 397 381
  153 Escondido SPV 210 196
  150 Miramar 83 83
  147 Otay Lake 85 85
  184 San Diego II 88 41
  173 Torrey Pines 113 41
San Joaquin 166 Lodi West 0 0
  070 Manteca 596 503
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 633 516
  202 Nipomo 74 74
  052 San Luis Obispo 128 128
  160 San Luis Obispo West 212 212
Santa Barbara 088 Cuyama 766 646
  094 Goleta Foothills 0 0
  231 Lompoc 343 313
  107 Santa Barbara 50 50
  230 Santa Barbara II 0 0
  232 Santa Maria II 177 176
  064 Santa Ynez 514 432
  165 Sisquoc 298 294
Santa Clara 211 Gilroy 431 392
Santa Cruz 104 De Laveaga 208 208
  209 Watsonville West II 128 128
Shasta 043 McArthur 1586 935
  224 Shasta College 617 482
Siskiyou 236 Macdoel II 1599 741
  225 Scott Valley 1522 825
  091 Tulelake FS 1618 844
Solano 121 Dixon 549 529
  212 Hastings Tract East 615 544
  139 Winters 508 478
Sonoma 158 Bennett Valley 617 565
  144 Petaluma East 549 489
  083 Santa Rosa 652 511
  103 Windsor 614 505
Stanislaus 206 Denair 533 501
  071 Modesto 599 527
  194 Oakdale 589 555
  161 Patterson 0 0
Sutter 235 Verona 604 535
Tehama 008 Gerber 0 0
  222 Gerber South 610 579
Tulare 203 Alpaugh 0 0
  182 Delano 514 471
  086 Lindcove 762 716
  169 Porterville 1023 872
Ventura 152 Camarillo 129 129
  217 Moorpark 40 40
  156 Oxnard 0 0
  198 Santa Paula 191 191
Yolo 155 Bryte 434 434
  006 Davis 448 438
  196 Esparto 0 0
  226 Woodland 449 440
Yuba 084 Browns Valley 279 279
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