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 272 263
  171 Union City 326 317
Amador 227 Plymouth 317 315
Butte 244 Biggs 288 284
  012 Durham 356 323
Colusa 250 Williams 284 266
Contra Costa 047 Brentwood 198 198
  170 Concord 284 281
  213 El Cerrito 17 17
  178 Moraga 327 288
El Dorado 013 Camino 210 210
  228 Diamond Springs 175 175
Fresno 205 Coalinga 125 125
  007 Firebaugh/Telles 222 222
  190 Five Points South West 221 217
  002 FivePoints/WSFS USDA 255 250
  080 Fresno State 227 227
  142 Orange Cove 210 210
  124 Panoche 257 250
  039 Parlier 238 236
  105 Westlands 258 251
Imperial 041 Calipatria/Mulberry 101 101
  087 Meloland 65 54
  175 Palo Verde II 262 190
  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 81 81
Inyo 035 Bishop 779 309
  183 Owens Lake North 533 392
  189 Owens Lake South 603 371
Kern 125 Arvin-Edison 189 189
  146 Belridge 245 243
  054 Blackwells Corner 232 232
  005 Shafter/USDA 249 242
Kings 021 Kettleman 0 0
  015 Stratford 212 211
Lassen 057 Buntingville 789 324
Los Angeles 216 Arleta 7 7
  215 Chatsworth 4 4
  133 Glendale 0 0
  174 Long Beach 0 0
  159 Monrovia 113 41
  197 Palmdale 410 347
  220 Palmdale Central 332 323
  078 Pomona 41 41
  204 Santa Clarita 42 42
  099 Santa Monica 0 0
  219 West Hills 20 20
Madera 145 Madera 0 0
  188 Madera II 0 0
Marin 187 Black Point 315 266
  157 Point San Pedro 245 245
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 0 0
Merced 092 Kesterson 338 308
  056 Los Banos 257 242
  148 Merced 380 277
Modoc 090 Alturas 809 378
Monterey 114 Arroyo Seco 218 217
  210 Carmel 109 108
  019 Castroville 151 151
  113 King City-Oasis Rd. 251 247
  193 Pacific Grove 4 4
  129 Pajaro 211 211
  116 Salinas North 97 97
  214 Salinas South II 81 81
Napa 109 Carneros 348 283
  077 Oakville 313 290
Orange 245 Coto de Caza 42 42
  075 Irvine 1 1
  241 San Clemente 32 32
Placer 195 Auburn 840 0
Riverside 135 Blythe NE 198 198
  118 Cathedral City 0 0
  239 Hemet 85 85
  200 Indio 2 46 46
  208 La Quinta II 39 39
  238 Moreno Valley 0 0
  136 Oasis 13 13
  240 Perris 151 149
  151 Ripley 171 171
  062 Temecula 0 0
  237 Temecula East III 18 18
  218 Thermal South 137 136
  044 U.C. Riverside 8 8
  179 Winchester 188 186
Sacramento 131 Fair Oaks 227 227
  140 Twitchell Island 230 225
San Benito 126 San Benito 212 212
  143 San Juan Valley 253 253
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 662 384
  233 Joshua Tree 332 311
  192 Lake Arrowhead 693 459
  234 Newberry Springs II 308 295
  117 Victorville 322 312
San Diego 207 Borrego Springs 140 139
  153 Escondido SPV 83 83
  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 306 245
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 332 280
  202 Nipomo 13 13
  052 San Luis Obispo 44 44
  160 San Luis Obispo West 69 69
Santa Barbara 088 Cuyama 365 345
  094 Goleta Foothills 0 0
  231 Lompoc 160 160
  107 Santa Barbara 1 1
  230 Santa Barbara II 0 0
  232 Santa Maria II 46 46
  064 Santa Ynez 249 225
  165 Sisquoc 101 101
Santa Clara 211 Gilroy 234 227
Santa Cruz 104 De Laveaga 94 94
  209 Watsonville West II 36 36
Shasta 043 McArthur 781 434
  224 Shasta College 284 204
Siskiyou 236 Macdoel II 790 316
  225 Scott Valley 768 411
  091 Tulelake FS 818 391
Solano 121 Dixon 287 279
  212 Hastings Tract East 322 286
  139 Winters 267 255
Sonoma 158 Bennett Valley 348 320
  144 Petaluma East 326 291
  083 Santa Rosa 381 286
  103 Windsor 356 284
Stanislaus 206 Denair 250 238
  071 Modesto 292 260
  194 Oakdale 265 264
  161 Patterson 0 0
Sutter 235 Verona 336 289
Tehama 008 Gerber 0 0
  222 Gerber South 295 283
Tulare 203 Alpaugh 0 0
  182 Delano 214 214
  086 Lindcove 327 324
  169 Porterville 472 430
Ventura 152 Camarillo 20 20
  217 Moorpark 8 8
  156 Oxnard 0 0
  198 Santa Paula 38 38
Yolo 155 Bryte 220 220
  006 Davis 240 237
  196 Esparto 0 0
  226 Woodland 240 239
Yuba 084 Browns Valley 86 86
Webmaster Email: fruitsandnuts@ucdavis.edu