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 144 135
  171 Union City 125 125
Amador 227 Plymouth 111 111
Butte 244 Biggs 144 140
  012 Durham 167 140
Colusa 250 Williams 122 105
Contra Costa 047 Brentwood 112 112
  170 Concord 132 132
  213 El Cerrito 0 0
  178 Moraga 184 152
El Dorado 013 Camino 0 0
  228 Diamond Springs 0 0
Fresno 205 Coalinga 62 62
  007 Firebaugh/Telles 108 108
  190 Five Points South West 115 113
  002 FivePoints/WSFS USDA 141 137
  080 Fresno State 133 133
  142 Orange Cove 101 101
  124 Panoche 138 131
  039 Parlier 136 134
  105 Westlands 129 122
Imperial 041 Calipatria/Mulberry 41 41
  087 Meloland 35 24
  175 Palo Verde II 147 75
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 39 39
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 36 36
Inyo 035 Bishop 272 105
  183 Owens Lake North 159 126
  189 Owens Lake South 210 126
Kern 125 Arvin-Edison 96 96
  146 Belridge 124 122
  054 Blackwells Corner 112 112
  005 Shafter/USDA 144 137
Kings 021 Kettleman 0 0
  015 Stratford 123 122
Lassen 057 Buntingville 295 117
Los Angeles 216 Arleta 2 2
  215 Chatsworth 0 0
  133 Glendale 0 0
  174 Long Beach 0 0
  159 Monrovia 94 22
  197 Palmdale 149 115
  220 Palmdale Central 95 86
  078 Pomona 22 22
  204 Santa Clarita 7 7
  099 Santa Monica 0 0
  219 West Hills 5 5
Madera 145 Madera 0 0
  188 Madera II 0 0
Marin 187 Black Point 185 140
  157 Point San Pedro 148 148
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 0 0
Merced 092 Kesterson 154 130
  056 Los Banos 140 127
  148 Merced 224 140
Modoc 090 Alturas 296 82
Monterey 114 Arroyo Seco 129 128
  210 Carmel 20 19
  019 Castroville 100 100
  113 King City-Oasis Rd. 135 131
  193 Pacific Grove 4 4
  129 Pajaro 127 127
  116 Salinas North 58 58
  214 Salinas South II 34 34
Napa 109 Carneros 180 131
  077 Oakville 147 127
Orange 245 Coto de Caza 6 6
  075 Irvine 0 0
  241 San Clemente 7 7
Placer 195 Auburn 288 0
Riverside 135 Blythe NE 81 81
  118 Cathedral City 0 0
  239 Hemet 31 31
  200 Indio 2 15 15
  208 La Quinta II 16 16
  238 Moreno Valley 0 0
  136 Oasis 4 4
  240 Perris 53 51
  151 Ripley 71 71
  062 Temecula 0 0
  237 Temecula East III 0 0
  218 Thermal South 58 58
  044 U.C. Riverside 1 1
  179 Winchester 79 77
Sacramento 131 Fair Oaks 132 132
  140 Twitchell Island 136 131
San Benito 126 San Benito 111 111
  143 San Juan Valley 139 139
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 228 140
  233 Joshua Tree 97 89
  192 Lake Arrowhead 245 185
  234 Newberry Springs II 103 91
  117 Victorville 104 95
San Diego 207 Borrego Springs 61 61
  153 Escondido SPV 20 20
  150 Miramar 1 1
  147 Otay Lake 0 0
  184 San Diego II 48 1
  173 Torrey Pines 73 1
San Joaquin 166 Lodi West 0 0
  070 Manteca 160 115
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 163 115
  202 Nipomo 7 7
  052 San Luis Obispo 27 27
  160 San Luis Obispo West 40 40
Santa Barbara 088 Cuyama 154 134
  094 Goleta Foothills 0 0
  231 Lompoc 90 90
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 25 25
  064 Santa Ynez 133 109
  165 Sisquoc 43 43
Santa Clara 211 Gilroy 131 124
Santa Cruz 104 De Laveaga 23 23
  209 Watsonville West II 11 11
Shasta 043 McArthur 293 122
  224 Shasta College 95 60
Siskiyou 236 Macdoel II 301 71
  225 Scott Valley 297 97
  091 Tulelake FS 302 100
Solano 121 Dixon 122 117
  212 Hastings Tract East 143 113
  139 Winters 113 101
Sonoma 158 Bennett Valley 173 146
  144 Petaluma East 178 145
  083 Santa Rosa 208 134
  103 Windsor 194 140
Stanislaus 206 Denair 143 135
  071 Modesto 149 120
  194 Oakdale 153 152
  161 Patterson 0 0
Sutter 235 Verona 165 127
Tehama 008 Gerber 0 0
  222 Gerber South 125 115
Tulare 203 Alpaugh 0 0
  182 Delano 119 119
  086 Lindcove 105 105
  169 Porterville 171 150
Ventura 152 Camarillo 4 4
  217 Moorpark 0 0
  156 Oxnard 0 0
  198 Santa Paula 11 11
Yolo 155 Bryte 111 111
  006 Davis 116 113
  196 Esparto 0 0
  226 Woodland 103 103
Yuba 084 Browns Valley 11 11
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