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 428 364
  171 Union City 417 406
Amador 227 Plymouth 544 524
Butte 012 Durham 446 395
Colusa 250 Williams 422 380
Contra Costa 047 Brentwood 343 322
  170 Concord 428 388
  213 El Cerrito 399 247
  178 Moraga 476 401
El Dorado 013 Camino 335 333
  228 Diamond Springs 295 295
Fresno 205 Coalinga 418 388
  007 Firebaugh/Telles 391 330
  190 Five Points South West 455 373
  002 FivePoints/WSFS USDA 499 400
  080 Fresno State 425 379
  142 Orange Cove 445 401
  124 Panoche 484 391
  039 Parlier 474 427
  105 Westlands 453 348
Imperial 041 Calipatria/Mulberry 201 190
  087 Meloland 139 139
  175 Palo Verde II 285 235
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 183 182
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 165 164
Inyo 035 Bishop 818 425
  183 Owens Lake North 657 507
  189 Owens Lake South 730 448
Kern 125 Arvin-Edison 420 392
  146 Belridge 461 416
  054 Blackwells Corner 449 415
  005 Shafter/USDA 536 415
Kings 021 Kettleman 0 0
  015 Stratford 481 395
Lassen 057 Buntingville 995 431
Los Angeles 216 Arleta 34 34
  215 Chatsworth 16 16
  133 Glendale 0 0
  174 Long Beach 138 138
  159 Monrovia 38 38
  197 Palmdale 540 325
  220 Palmdale Central 419 334
  078 Pomona 126 124
  204 Santa Clarita 53 53
  099 Santa Monica 3 3
  219 West Hills 46 46
Madera 145 Madera 0 0
  188 Madera II 629 428
Marin 187 Black Point 449 368
  157 Point San Pedro 324 316
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 474 315
Merced 092 Kesterson 522 380
  056 Los Banos 439 337
  148 Merced 593 397
Modoc 090 Alturas 1083 488
Monterey 114 Arroyo Seco 389 361
  210 Carmel 262 262
  019 Castroville 549 444
  113 King City-Oasis Rd. 434 381
  193 Pacific Grove 59 59
  129 Pajaro 178 177
  116 Salinas North 209 207
  214 Salinas South II 206 206
Napa 109 Carneros 484 392
  077 Oakville 448 433
Orange 245 Coto de Caza 83 83
  075 Irvine 31 31
  241 San Clemente 109 109
Placer 195 Auburn 268 263
Riverside 135 Blythe NE 216 203
  118 Cathedral City 0 0
  239 Hemet 153 148
  200 Indio 2 94 94
  208 La Quinta II 206 187
  238 Moreno Valley 26 26
  136 Oasis 53 53
  240 Perris 228 215
  151 Ripley 229 208
  062 Temecula 17 8
  237 Temecula East III 34 34
  218 Thermal South 166 166
  044 U.C. Riverside 43 43
  179 Winchester 294 278
Sacramento 131 Fair Oaks 367 367
  140 Twitchell Island 356 335
San Benito 126 San Benito 395 380
  143 San Juan Valley 407 382
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 881 497
  233 Joshua Tree 413 377
  192 Lake Arrowhead 739 480
  234 Newberry Springs II 416 356
  117 Victorville 0 0
San Diego 207 Borrego Springs 213 201
  153 Escondido SPV 323 289
  150 Miramar 75 75
  147 Otay Lake 103 103
  184 San Diego II 13 13
  173 Torrey Pines 4 4
San Joaquin 166 Lodi West 0 0
  070 Manteca 480 399
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 521 341
  202 Nipomo 68 68
  052 San Luis Obispo 84 84
  160 San Luis Obispo West 146 146
Santa Barbara 088 Cuyama 548 444
  094 Goleta Foothills 0 0
  231 Lompoc 372 340
  107 Santa Barbara 50 50
  230 Santa Barbara II 0 0
  232 Santa Maria II 186 186
  064 Santa Ynez 387 261
  165 Sisquoc 458 374
Santa Clara 211 Gilroy 401 325
Santa Cruz 104 De Laveaga 178 178
  209 Watsonville West II 144 144
Shasta 043 McArthur 1081 621
  224 Shasta College 431 354
Siskiyou 236 Macdoel II 1145 483
  225 Scott Valley 1050 508
  091 Tulelake FS 1169 514
Solano 121 Dixon 554 410
  212 Hastings Tract East 650 517
  139 Winters 445 382
Sonoma 158 Bennett Valley 506 481
  144 Petaluma East 934 629
  083 Santa Rosa 509 387
  103 Windsor 488 408
Stanislaus 206 Denair 438 387
  071 Modesto 440 330
  194 Oakdale 451 433
  161 Patterson 227 189
Sutter 235 Verona 445 384
Tehama 008 Gerber 0 0
  222 Gerber South 435 401
Tulare 203 Alpaugh 283 231
  182 Delano 0 0
  086 Lindcove 458 418
  169 Porterville 621 478
Ventura 152 Camarillo 101 101
  217 Moorpark 30 30
  156 Oxnard 0 0
  198 Santa Paula 86 82
Yolo 155 Bryte 339 339
  006 Davis 385 364
  196 Esparto 0 0
  226 Woodland 350 329
Yuba 084 Browns Valley 240 240
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