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 211 210
  171 Union City 150 150
Amador 227 Plymouth 352 329
Butte 012 Durham 292 278
Colusa 032 Colusa 0 0
Contra Costa 047 Brentwood 144 144
  170 Concord 377 318
  213 El Cerrito 58 58
  178 Moraga 274 269
El Dorado 013 Camino 352 344
  228 Diamond Springs 303 303
Fresno 205 Coalinga 165 164
  007 Firebaugh/Telles 156 156
  190 Five Points South West 151 148
  002 FivePoints/WSFS USDA 204 192
  080 Fresno State 196 196
  142 Orange Cove 204 203
  124 Panoche 200 199
  039 Parlier 215 215
  105 Westlands 164 161
Imperial 041 Calipatria/Mulberry 129 129
  087 Meloland 56 56
  175 Palo Verde II 178 177
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 89 89
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 105 105
Inyo 035 Bishop 550 326
  183 Owens Lake North 439 373
  189 Owens Lake South 466 308
Kern 125 Arvin-Edison 178 178
  146 Belridge 206 199
  054 Blackwells Corner 222 220
  005 Shafter/USDA 242 232
Kings 021 Kettleman 188 175
  015 Stratford 213 197
Lassen 057 Buntingville 669 352
Los Angeles 216 Arleta 35 35
  215 Chatsworth 14 14
  133 Glendale 0 0
  174 Long Beach 48 48
  159 Monrovia 23 23
  197 Palmdale 396 311
  220 Palmdale Central 284 244
  078 Pomona 74 74
  204 Santa Clarita 100 100
  099 Santa Monica 0 0
  219 West Hills 57 57
Madera 145 Madera 0 0
  188 Madera II 392 353
Marin 187 Black Point 179 174
  157 Point San Pedro 150 150
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 293 263
Merced 092 Kesterson 230 194
  056 Los Banos 186 182
  148 Merced 317 251
Modoc 090 Alturas 712 346
Monterey 114 Arroyo Seco 161 159
  210 Carmel 171 171
  019 Castroville 134 134
  113 King City-Oasis Rd. 179 176
  193 Pacific Grove 33 33
  129 Pajaro 143 143
  116 Salinas North 193 193
  214 Salinas South II 123 123
Napa 109 Carneros 235 224
  077 Oakville 254 251
Orange 245 Coto de Caza 77 77
  075 Irvine 8 8
  241 San Clemente 68 68
Placer 195 Auburn 215 215
Riverside 135 Blythe NE 143 143
  118 Cathedral City 0 0
  239 Hemet 142 142
  200 Indio 2 47 47
  208 La Quinta II 84 84
  238 Moreno Valley 37 37
  136 Oasis 22 22
  240 Perris 85 85
  151 Ripley 148 148
  062 Temecula 0 0
  237 Temecula East III 95 95
  218 Thermal South 117 117
  044 U.C. Riverside 44 44
  179 Winchester 133 133
Sacramento 131 Fair Oaks 185 183
  140 Twitchell Island 149 149
San Benito 126 San Benito 155 155
  143 San Juan Valley 190 183
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 684 292
  233 Joshua Tree 244 220
  192 Lake Arrowhead 629 438
  234 Newberry Springs II 209 184
  117 Victorville 293 247
San Diego 207 Borrego Springs 108 108
  153 Escondido SPV 150 136
  150 Miramar 19 19
  147 Otay Lake 8 8
  184 San Diego II 0 0
  173 Torrey Pines 0 0
San Joaquin 166 Lodi West 0 0
  070 Manteca 199 199
  167 Tracy 141 141
San Luis Obispo 163 Atascadero 309 260
  202 Nipomo 49 49
  052 San Luis Obispo 50 50
  160 San Luis Obispo West 74 74
Santa Barbara 088 Cuyama 331 308
  094 Goleta Foothills 0 0
  231 Lompoc 123 123
  107 Santa Barbara 71 71
  230 Santa Barbara II 0 0
  232 Santa Maria II 90 90
  064 Santa Ynez 290 254
  165 Sisquoc 278 242
Santa Clara 211 Gilroy 163 156
Santa Cruz 104 De Laveaga 262 242
  209 Watsonville West II 71 71
Shasta 043 McArthur 727 473
  224 Shasta College 313 289
Siskiyou 236 Macdoel II 718 394
  225 Scott Valley 631 447
  091 Tulelake FS 720 422
Solano 121 Dixon 344 323
  212 Hastings Tract East 247 239
  139 Winters 233 219
Sonoma 158 Bennett Valley 311 298
  144 Petaluma East 669 542
  083 Santa Rosa 260 246
  103 Windsor 362 327
Stanislaus 206 Denair 176 176
  071 Modesto 191 189
  194 Oakdale 0 0
  161 Patterson 138 138
Sutter 235 Verona 277 270
Tehama 008 Gerber 0 0
  222 Gerber South 272 263
Tulare 203 Alpaugh 256 245
  182 Delano 269 258
  086 Lindcove 209 209
  169 Porterville 256 245
Ventura 152 Camarillo 79 79
  217 Moorpark 27 27
  156 Oxnard 76 76
  198 Santa Paula 113 112
Yolo 155 Bryte 192 192
  006 Davis 192 191
  196 Esparto 135 135
  226 Woodland 191 112
Yuba 084 Browns Valley 152 152
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