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 294 285
  171 Union City 343 334
Amador 227 Plymouth 349 347
Butte 244 Biggs 312 308
  012 Durham 381 348
Colusa 250 Williams 308 290
Contra Costa 047 Brentwood 222 222
  170 Concord 303 300
  213 El Cerrito 17 17
  178 Moraga 351 312
El Dorado 013 Camino 228 228
  228 Diamond Springs 194 194
Fresno 205 Coalinga 150 150
  007 Firebaugh/Telles 250 250
  190 Five Points South West 247 243
  002 FivePoints/WSFS USDA 280 275
  080 Fresno State 251 251
  142 Orange Cove 238 238
  124 Panoche 285 278
  039 Parlier 262 260
  105 Westlands 284 277
Imperial 041 Calipatria/Mulberry 108 108
  087 Meloland 65 54
  175 Palo Verde II 271 199
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 83 83
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 93 93
Inyo 035 Bishop 810 314
  183 Owens Lake North 576 416
  189 Owens Lake South 637 383
Kern 125 Arvin-Edison 203 203
  146 Belridge 275 272
  054 Blackwells Corner 263 263
  005 Shafter/USDA 277 270
Kings 021 Kettleman 0 0
  015 Stratford 234 233
Lassen 057 Buntingville 834 343
Los Angeles 216 Arleta 9 9
  215 Chatsworth 4 4
  133 Glendale 0 0
  174 Long Beach 0 0
  159 Monrovia 114 42
  197 Palmdale 439 370
  220 Palmdale Central 358 349
  078 Pomona 42 42
  204 Santa Clarita 51 51
  099 Santa Monica 0 0
  219 West Hills 32 32
Madera 145 Madera 0 0
  188 Madera II 0 0
Marin 187 Black Point 335 286
  157 Point San Pedro 258 258
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 0 0
Merced 092 Kesterson 370 337
  056 Los Banos 283 268
  148 Merced 409 306
Modoc 090 Alturas 852 400
Monterey 114 Arroyo Seco 236 235
  210 Carmel 122 121
  019 Castroville 160 160
  113 King City-Oasis Rd. 271 267
  193 Pacific Grove 4 4
  129 Pajaro 224 224
  116 Salinas North 104 104
  214 Salinas South II 93 93
Napa 109 Carneros 370 305
  077 Oakville 338 315
Orange 245 Coto de Caza 53 53
  075 Irvine 1 1
  241 San Clemente 38 38
Placer 195 Auburn 888 0
Riverside 135 Blythe NE 213 213
  118 Cathedral City 0 0
  239 Hemet 100 100
  200 Indio 2 55 55
  208 La Quinta II 47 47
  238 Moreno Valley 0 0
  136 Oasis 13 13
  240 Perris 166 164
  151 Ripley 193 193
  062 Temecula 0 0
  237 Temecula East III 22 22
  218 Thermal South 155 154
  044 U.C. Riverside 16 16
  179 Winchester 207 205
Sacramento 131 Fair Oaks 241 241
  140 Twitchell Island 251 246
San Benito 126 San Benito 232 232
  143 San Juan Valley 278 278
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 729 405
  233 Joshua Tree 356 335
  192 Lake Arrowhead 725 467
  234 Newberry Springs II 333 318
  117 Victorville 347 337
San Diego 207 Borrego Springs 155 154
  153 Escondido SPV 90 90
  150 Miramar 6 6
  147 Otay Lake 10 10
  184 San Diego II 48 1
  173 Torrey Pines 73 1
San Joaquin 166 Lodi West 0 0
  070 Manteca 327 266
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 355 303
  202 Nipomo 13 13
  052 San Luis Obispo 44 44
  160 San Luis Obispo West 69 69
Santa Barbara 088 Cuyama 389 369
  094 Goleta Foothills 0 0
  231 Lompoc 178 178
  107 Santa Barbara 1 1
  230 Santa Barbara II 0 0
  232 Santa Maria II 54 54
  064 Santa Ynez 271 247
  165 Sisquoc 108 108
Santa Clara 211 Gilroy 250 243
Santa Cruz 104 De Laveaga 101 101
  209 Watsonville West II 41 41
Shasta 043 McArthur 821 452
  224 Shasta College 303 220
Siskiyou 236 Macdoel II 838 337
  225 Scott Valley 811 427
  091 Tulelake FS 864 415
Solano 121 Dixon 308 300
  212 Hastings Tract East 346 310
  139 Winters 293 281
Sonoma 158 Bennett Valley 376 348
  144 Petaluma East 338 303
  083 Santa Rosa 409 312
  103 Windsor 385 313
Stanislaus 206 Denair 271 259
  071 Modesto 318 286
  194 Oakdale 291 290
  161 Patterson 0 0
Sutter 235 Verona 358 311
Tehama 008 Gerber 0 0
  222 Gerber South 316 304
Tulare 203 Alpaugh 0 0
  182 Delano 252 252
  086 Lindcove 362 358
  169 Porterville 507 455
Ventura 152 Camarillo 26 26
  217 Moorpark 11 11
  156 Oxnard 0 0
  198 Santa Paula 43 43
Yolo 155 Bryte 236 236
  006 Davis 259 256
  196 Esparto 0 0
  226 Woodland 260 259
Yuba 084 Browns Valley 103 103
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