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 67 67
  171 Union City 61 61
Amador 227 Plymouth 108 108
Butte 012 Durham 68 68
Colusa 250 Williams 87 87
Contra Costa 047 Brentwood 46 46
  170 Concord 64 64
  213 El Cerrito 161 89
  178 Moraga 101 101
El Dorado 013 Camino 95 95
  228 Diamond Springs 66 66
Fresno 205 Coalinga 41 41
  007 Firebaugh/Telles 50 50
  190 Five Points South West 82 80
  002 FivePoints/WSFS USDA 80 80
  080 Fresno State 53 53
  142 Orange Cove 58 58
  124 Panoche 100 100
  039 Parlier 65 65
  105 Westlands 69 69
Imperial 041 Calipatria/Mulberry 13 13
  087 Meloland 1 1
  175 Palo Verde II 27 27
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 12 12
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 11 11
Inyo 035 Bishop 279 187
  183 Owens Lake North 170 169
  189 Owens Lake South 210 169
Kern 125 Arvin-Edison 29 29
  146 Belridge 50 50
  054 Blackwells Corner 48 48
  005 Shafter/USDA 73 73
Kings 021 Kettleman 0 0
  015 Stratford 69 69
Lassen 057 Buntingville 277 190
Los Angeles 216 Arleta 0 0
  215 Chatsworth 0 0
  133 Glendale 0 0
  174 Long Beach 3 3
  159 Monrovia 0 0
  197 Palmdale 116 97
  220 Palmdale Central 68 63
  078 Pomona 0 0
  204 Santa Clarita 0 0
  099 Santa Monica 0 0
  219 West Hills 0 0
Madera 145 Madera 0 0
  188 Madera II 152 137
Marin 187 Black Point 81 80
  157 Point San Pedro 57 57
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 93 78
Merced 092 Kesterson 115 113
  056 Los Banos 78 78
  148 Merced 145 133
Modoc 090 Alturas 381 290
Monterey 114 Arroyo Seco 68 68
  210 Carmel 69 69
  019 Castroville 291 200
  113 King City-Oasis Rd. 82 82
  193 Pacific Grove 5 5
  129 Pajaro 27 27
  116 Salinas North 37 37
  214 Salinas South II 35 35
Napa 109 Carneros 98 95
  077 Oakville 107 105
Orange 245 Coto de Caza 0 0
  075 Irvine 0 0
  241 San Clemente 0 0
Placer 195 Auburn 16 16
Riverside 135 Blythe NE 25 25
  118 Cathedral City 0 0
  239 Hemet 9 9
  200 Indio 2 1 1
  208 La Quinta II 64 59
  238 Moreno Valley 0 0
  136 Oasis 0 0
  240 Perris 33 33
  151 Ripley 30 30
  062 Temecula 0 0
  237 Temecula East III 3 3
  218 Thermal South 14 14
  044 U.C. Riverside 0 0
  179 Winchester 43 43
Sacramento 131 Fair Oaks 33 33
  140 Twitchell Island 46 46
San Benito 126 San Benito 70 70
  143 San Juan Valley 78 78
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 298 220
  233 Joshua Tree 75 71
  192 Lake Arrowhead 222 188
  234 Newberry Springs II 46 43
  117 Victorville 0 0
San Diego 207 Borrego Springs 15 15
  153 Escondido SPV 51 51
  150 Miramar 2 2
  147 Otay Lake 0 0
  184 San Diego II 0 0
  173 Torrey Pines 0 0
San Joaquin 166 Lodi West 0 0
  070 Manteca 87 87
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 113 107
  202 Nipomo 1 1
  052 San Luis Obispo 9 9
  160 San Luis Obispo West 27 27
Santa Barbara 088 Cuyama 129 129
  094 Goleta Foothills 0 0
  231 Lompoc 33 33
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 16 16
  064 Santa Ynez 95 93
  165 Sisquoc 90 90
Santa Clara 211 Gilroy 70 70
Santa Cruz 104 De Laveaga 34 34
  209 Watsonville West II 17 17
Shasta 043 McArthur 382 319
  224 Shasta College 107 104
Siskiyou 236 Macdoel II 414 267
  225 Scott Valley 315 227
  091 Tulelake FS 418 296
Solano 121 Dixon 161 136
  212 Hastings Tract East 176 171
  139 Winters 80 80
Sonoma 158 Bennett Valley 92 91
  144 Petaluma East 300 267
  083 Santa Rosa 89 79
  103 Windsor 84 78
Stanislaus 206 Denair 68 68
  071 Modesto 83 83
  194 Oakdale 71 71
  161 Patterson 83 83
Sutter 235 Verona 64 64
Tehama 008 Gerber 0 0
  222 Gerber South 85 85
Tulare 203 Alpaugh 70 70
  182 Delano 0 0
  086 Lindcove 44 44
  169 Porterville 142 142
Ventura 152 Camarillo 0 0
  217 Moorpark 0 0
  156 Oxnard 0 0
  198 Santa Paula 2 2
Yolo 155 Bryte 28 28
  006 Davis 61 61
  196 Esparto 0 0
  226 Woodland 46 46
Yuba 084 Browns Valley 7 7
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