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 162 162
  171 Union City 127 127
Amador 227 Plymouth 281 268
Butte 012 Durham 200 200
Colusa 032 Colusa 0 0
Contra Costa 047 Brentwood 102 102
  170 Concord 311 257
  213 El Cerrito 17 17
  178 Moraga 212 210
El Dorado 013 Camino 283 283
  228 Diamond Springs 234 234
Fresno 205 Coalinga 135 134
  007 Firebaugh/Telles 126 126
  190 Five Points South West 126 124
  002 FivePoints/WSFS USDA 149 147
  080 Fresno State 151 151
  142 Orange Cove 164 164
  124 Panoche 157 156
  039 Parlier 175 175
  105 Westlands 137 134
Imperial 041 Calipatria/Mulberry 86 86
  087 Meloland 32 32
  175 Palo Verde II 127 126
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 56 56
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 69 69
Inyo 035 Bishop 466 284
  183 Owens Lake North 348 304
  189 Owens Lake South 376 278
Kern 125 Arvin-Edison 140 140
  146 Belridge 170 163
  054 Blackwells Corner 176 174
  005 Shafter/USDA 197 189
Kings 021 Kettleman 154 147
  015 Stratford 177 167
Lassen 057 Buntingville 580 333
Los Angeles 216 Arleta 22 22
  215 Chatsworth 3 3
  133 Glendale 0 0
  174 Long Beach 47 47
  159 Monrovia 20 20
  197 Palmdale 354 275
  220 Palmdale Central 256 216
  078 Pomona 64 64
  204 Santa Clarita 69 69
  099 Santa Monica 0 0
  219 West Hills 52 52
Madera 145 Madera 0 0
  188 Madera II 318 290
Marin 187 Black Point 132 132
  157 Point San Pedro 106 106
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 230 215
Merced 092 Kesterson 176 150
  056 Los Banos 150 146
  148 Merced 251 207
Modoc 090 Alturas 599 309
Monterey 114 Arroyo Seco 133 131
  210 Carmel 139 139
  019 Castroville 110 110
  113 King City-Oasis Rd. 157 155
  193 Pacific Grove 27 27
  129 Pajaro 110 110
  116 Salinas North 158 158
  214 Salinas South II 107 107
Napa 109 Carneros 179 178
  077 Oakville 196 196
Orange 245 Coto de Caza 55 55
  075 Irvine 8 8
  241 San Clemente 57 57
Placer 195 Auburn 156 156
Riverside 135 Blythe NE 84 84
  118 Cathedral City 0 0
  239 Hemet 116 116
  200 Indio 2 29 29
  208 La Quinta II 54 54
  238 Moreno Valley 29 29
  136 Oasis 13 13
  240 Perris 76 76
  151 Ripley 100 100
  062 Temecula 0 0
  237 Temecula East III 77 77
  218 Thermal South 75 75
  044 U.C. Riverside 32 32
  179 Winchester 110 110
Sacramento 131 Fair Oaks 127 127
  140 Twitchell Island 102 102
San Benito 126 San Benito 135 135
  143 San Juan Valley 171 167
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 593 249
  233 Joshua Tree 178 159
  192 Lake Arrowhead 536 387
  234 Newberry Springs II 159 139
  117 Victorville 245 204
San Diego 207 Borrego Springs 61 61
  153 Escondido SPV 128 114
  150 Miramar 19 19
  147 Otay Lake 7 7
  184 San Diego II 7 7
  173 Torrey Pines 0 0
San Joaquin 166 Lodi West 0 0
  070 Manteca 153 153
  167 Tracy 102 102
San Luis Obispo 163 Atascadero 235 207
  202 Nipomo 40 40
  052 San Luis Obispo 49 49
  160 San Luis Obispo West 62 62
Santa Barbara 088 Cuyama 277 257
  094 Goleta Foothills 0 0
  231 Lompoc 102 102
  107 Santa Barbara 55 55
  230 Santa Barbara II 0 0
  232 Santa Maria II 70 70
  064 Santa Ynez 240 207
  165 Sisquoc 215 187
Santa Clara 211 Gilroy 143 138
Santa Cruz 104 De Laveaga 193 188
  209 Watsonville West II 58 58
Shasta 043 McArthur 607 414
  224 Shasta College 225 224
Siskiyou 236 Macdoel II 611 361
  225 Scott Valley 530 405
  091 Tulelake FS 608 385
Solano 121 Dixon 252 237
  212 Hastings Tract East 178 175
  139 Winters 151 147
Sonoma 158 Bennett Valley 219 217
  144 Petaluma East 552 455
  083 Santa Rosa 200 199
  103 Windsor 297 280
Stanislaus 206 Denair 135 135
  071 Modesto 152 150
  194 Oakdale 0 0
  161 Patterson 129 127
Sutter 235 Verona 186 184
Tehama 008 Gerber 0 0
  222 Gerber South 182 182
Tulare 203 Alpaugh 190 184
  182 Delano 217 208
  086 Lindcove 172 172
  169 Porterville 190 184
Ventura 152 Camarillo 63 63
  217 Moorpark 17 17
  156 Oxnard 54 54
  198 Santa Paula 93 93
Yolo 155 Bryte 114 114
  006 Davis 113 113
  196 Esparto 70 70
  226 Woodland 111 75
Yuba 084 Browns Valley 91 91
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