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 529 465
  171 Union City 653 641
Amador 227 Plymouth 695 675
Butte 012 Durham 583 527
Colusa 250 Williams 550 508
Contra Costa 047 Brentwood 451 429
  170 Concord 533 493
  213 El Cerrito 399 247
  178 Moraga 591 511
El Dorado 013 Camino 383 381
  228 Diamond Springs 351 351
Fresno 205 Coalinga 567 536
  007 Firebaugh/Telles 477 416
  190 Five Points South West 554 469
  002 FivePoints/WSFS USDA 603 491
  080 Fresno State 531 485
  142 Orange Cove 545 501
  124 Panoche 602 497
  039 Parlier 583 536
  105 Westlands 595 482
Imperial 041 Calipatria/Mulberry 308 297
  087 Meloland 181 181
  175 Palo Verde II 455 394
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 254 253
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 221 220
Inyo 035 Bishop 1120 596
  183 Owens Lake North 960 681
  189 Owens Lake South 1031 630
Kern 125 Arvin-Edison 528 499
  146 Belridge 554 506
  054 Blackwells Corner 627 549
  005 Shafter/USDA 641 510
Kings 021 Kettleman 0 0
  015 Stratford 581 488
Lassen 057 Buntingville 1448 653
Los Angeles 216 Arleta 43 43
  215 Chatsworth 17 17
  133 Glendale 0 0
  174 Long Beach 159 159
  159 Monrovia 38 38
  197 Palmdale 735 501
  220 Palmdale Central 544 459
  078 Pomona 131 129
  204 Santa Clarita 67 67
  099 Santa Monica 3 3
  219 West Hills 58 58
Madera 145 Madera 0 0
  188 Madera II 933 704
Marin 187 Black Point 568 472
  157 Point San Pedro 383 375
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 674 508
Merced 092 Kesterson 679 505
  056 Los Banos 535 421
  148 Merced 729 508
Modoc 090 Alturas 1459 745
Monterey 114 Arroyo Seco 441 413
  210 Carmel 289 289
  019 Castroville 581 476
  113 King City-Oasis Rd. 488 435
  193 Pacific Grove 61 61
  129 Pajaro 198 197
  116 Salinas North 235 233
  214 Salinas South II 219 219
Napa 109 Carneros 626 519
  077 Oakville 595 580
Orange 245 Coto de Caza 93 93
  075 Irvine 34 34
  241 San Clemente 129 129
Placer 195 Auburn 309 304
Riverside 135 Blythe NE 327 313
  118 Cathedral City 0 0
  239 Hemet 169 164
  200 Indio 2 132 132
  208 La Quinta II 249 230
  238 Moreno Valley 26 26
  136 Oasis 58 58
  240 Perris 287 274
  151 Ripley 366 344
  062 Temecula 17 8
  237 Temecula East III 36 36
  218 Thermal South 246 246
  044 U.C. Riverside 49 49
  179 Winchester 298 282
Sacramento 131 Fair Oaks 463 463
  140 Twitchell Island 451 429
San Benito 126 San Benito 457 442
  143 San Juan Valley 470 445
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 1231 684
  233 Joshua Tree 571 535
  192 Lake Arrowhead 1025 672
  234 Newberry Springs II 570 510
  117 Victorville 0 0
San Diego 207 Borrego Springs 280 268
  153 Escondido SPV 418 382
  150 Miramar 85 85
  147 Otay Lake 115 115
  184 San Diego II 13 13
  173 Torrey Pines 4 4
San Joaquin 166 Lodi West 0 0
  070 Manteca 618 522
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 672 476
  202 Nipomo 75 75
  052 San Luis Obispo 101 101
  160 San Luis Obispo West 168 168
Santa Barbara 088 Cuyama 689 585
  094 Goleta Foothills 0 0
  231 Lompoc 454 422
  107 Santa Barbara 52 52
  230 Santa Barbara II 1 1
  232 Santa Maria II 208 208
  064 Santa Ynez 473 332
  165 Sisquoc 621 541
Santa Clara 211 Gilroy 494 417
Santa Cruz 104 De Laveaga 201 201
  209 Watsonville West II 151 151
Shasta 043 McArthur 1475 884
  224 Shasta College 566 469
Siskiyou 236 Macdoel II 1551 717
  225 Scott Valley 1445 777
  091 Tulelake FS 1571 746
Solano 121 Dixon 841 580
  212 Hastings Tract East 1007 813
  139 Winters 581 517
Sonoma 158 Bennett Valley 688 663
  144 Petaluma East 1416 986
  083 Santa Rosa 665 537
  103 Windsor 638 547
Stanislaus 206 Denair 531 477
  071 Modesto 550 419
  194 Oakdale 572 553
  161 Patterson 227 189
Sutter 235 Verona 565 496
Tehama 008 Gerber 0 0
  222 Gerber South 560 526
Tulare 203 Alpaugh 283 231
  182 Delano 0 0
  086 Lindcove 648 607
  169 Porterville 870 703
Ventura 152 Camarillo 114 114
  217 Moorpark 32 32
  156 Oxnard 0 0
  198 Santa Paula 94 90
Yolo 155 Bryte 418 418
  006 Davis 492 470
  196 Esparto 0 0
  226 Woodland 450 429
Yuba 084 Browns Valley 273 273
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