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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 134 134
  171 Union City 80 80
Amador 227 Plymouth 316 316
Butte 012 Durham 187 185
Colusa 032 Colusa 117 117
Contra Costa 047 Brentwood 80 80
  170 Concord 652 414
  213 El Cerrito 0 0
  178 Moraga 216 216
El Dorado 013 Camino 276 276
  228 Diamond Springs 162 162
Fresno 205 Coalinga 107 107
  007 Firebaugh/Telles 115 115
  190 Five Points South West 142 142
  002 FivePoints/WSFS USDA 170 170
  080 Fresno State 149 149
  142 Orange Cove 154 154
  124 Panoche 123 123
  039 Parlier 623 579
  105 Westlands 132 132
Imperial 041 Calipatria/Mulberry 131 131
  087 Meloland 46 46
  175 Palo Verde II 221 221
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 69 69
  201 UC-Andrade 42 42
  186 UC-San Luis 11 11
  181 Westmorland North 101 99
Inyo 035 Bishop 732 459
  183 Owens Lake North 574 514
  189 Owens Lake South 575 463
Kern 125 Arvin-Edison 153 153
  146 Belridge 164 164
  054 Blackwells Corner 218 218
  138 Famoso 232 232
  005 Shafter/USDA 633 460
Kings 021 Kettleman 83 83
  015 Stratford 162 161
Lassen 057 Buntingville 932 493
Los Angeles 216 Arleta 23 23
  215 Chatsworth 13 13
  133 Glendale 26 26
  174 Long Beach 101 101
  159 Monrovia 9 9
  197 Palmdale 450 368
  220 Palmdale Central 301 294
  078 Pomona 16 16
  204 Santa Clarita 69 69
  099 Santa Monica 0 0
  219 West Hills 42 42
Madera 145 Madera 0 0
  188 Madera II 165 165
Marin 187 Black Point 119 119
  157 Point San Pedro 47 47
Mendocino 085 Hopland FS 118 118
  106 Sanel Valley 201 195
Merced 092 Kesterson 376 366
  056 Los Banos 143 143
  148 Merced 257 257
Modoc 090 Alturas 956 712
Monterey 114 Arroyo Seco 85 85
  210 Carmel 84 84
  019 Castroville 228 228
  113 King City-Oasis Rd. 127 127
  193 Pacific Grove 2 2
  129 Pajaro 39 39
  116 Salinas North 32 32
  214 Salinas South II 24 24
Napa 109 Carneros 177 175
  077 Oakville 160 160
Orange 075 Irvine 0 0
Placer 195 Auburn 48 48
Riverside 135 Blythe NE 148 148
  118 Cathedral City 0 0
  200 Indio 2 51 51
  208 La Quinta II 164 163
  238 Moreno Valley 39 39
  136 Oasis 0 0
  240 Perris 172 172
  151 Ripley 182 182
  062 Temecula 0 0
  237 Temecula East III 13 13
  218 Thermal South 138 138
  044 U.C. Riverside 27 27
  179 Winchester 156 156
Sacramento 131 Fair Oaks 82 82
  140 Twitchell Island 83 83
San Benito 126 San Benito 78 78
  143 San Juan Valley 114 114
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 930 451
  233 Joshua Tree 299 294
  192 Lake Arrowhead 759 573
  117 Victorville 333 322
San Diego 207 Borrego Springs 127 127
  153 Escondido SPV 158 158
  173 La Jolla 0 0
  150 Miramar 0 0
  147 Otay Lake 0 0
  184 San Diego II 0 0
San Joaquin 166 Lodi West 167 167
  070 Manteca 141 141
  167 Tracy 108 108
San Luis Obispo 163 Atascadero 250 231
  202 Nipomo 46 46
  052 San Luis Obispo 28 28
  160 San Luis Obispo West 45 45
Santa Barbara 088 Cuyama 387 377
  094 Goleta Foothills 0 0
  231 Lompoc 121 121
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 38 38
  064 Santa Ynez 213 203
  165 Sisquoc 94 94
Santa Clara 211 Gilroy 176 175
Santa Cruz 104 De Laveaga 71 71
  209 Watsonville West II 19 19
Shasta 043 McArthur 909 719
  224 Shasta College 205 187
Siskiyou 091 Tulelake FS 955 719
Solano 121 Dixon 489 483
  212 Hastings Tract East 148 148
  139 Winters 150 148
Sonoma 158 Bennett Valley 288 288
  144 Petaluma East 480 473
  083 Santa Rosa 209 207
  103 Windsor 270 270
Stanislaus 206 Denair 87 87
  071 Modesto 161 161
  194 Oakdale 126 126
  161 Patterson 467 376
Sutter 235 Verona 172 172
Tehama 008 Gerber 0 0
Tulare 203 Alpaugh 328 275
  182 Delano 230 226
  086 Lindcove 113 113
  169 Porterville 319 319
Ventura 152 Camarillo 11 11
  156 Oxnard 18 18
  198 Santa Paula 211 170
Yolo 155 Bryte 61 61
  006 Davis 81 81
  196 Esparto 26 26
  226 Woodland 83 83
Yuba 084 Browns Valley 38 38
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