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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 74 74
  171 Union City 39 39
Amador 227 Plymouth 0 0
Butte 012 Durham 136 134
Colusa 032 Colusa 69 69
Contra Costa 047 Brentwood 45 45
  170 Concord 204 187
  213 El Cerrito 0 0
  178 Moraga 136 136
El Dorado 013 Camino 106 106
  228 Diamond Springs 102 102
Fresno 205 Coalinga 47 47
  007 Firebaugh/Telles 44 44
  190 Five Points South West 71 71
  002 FivePoints/WSFS USDA 81 81
  080 Fresno State 62 62
  142 Orange Cove 52 52
  124 Panoche 48 48
  039 Parlier 211 204
  105 Westlands 56 56
Imperial 041 Calipatria/Mulberry 43 43
  087 Meloland 10 10
  175 Palo Verde II 102 102
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 29 29
  201 UC-Andrade 10 10
  186 UC-San Luis 0 0
  181 Westmorland North 35 33
Inyo 035 Bishop 305 200
  183 Owens Lake North 201 184
  189 Owens Lake South 185 173
Kern 125 Arvin-Edison 49 49
  146 Belridge 60 60
  054 Blackwells Corner 53 53
  138 Famoso 51 51
  005 Shafter/USDA 215 203
Kings 021 Kettleman 11 11
  015 Stratford 67 66
Lassen 057 Buntingville 402 224
Los Angeles 216 Arleta 1 1
  215 Chatsworth 10 10
  133 Glendale 1 1
  174 Long Beach 27 27
  159 Monrovia 0 0
  197 Palmdale 179 143
  220 Palmdale Central 0 0
  078 Pomona 5 5
  204 Santa Clarita 13 13
  099 Santa Monica 0 0
  219 West Hills 10 10
Madera 145 Madera 0 0
  188 Madera II 76 76
Marin 187 Black Point 80 80
  157 Point San Pedro 34 34
Mendocino 085 Hopland FS 73 73
  106 Sanel Valley 148 146
Merced 092 Kesterson 130 124
  056 Los Banos 56 56
  148 Merced 115 115
Modoc 090 Alturas 452 298
Monterey 114 Arroyo Seco 38 38
  210 Carmel 5 5
  019 Castroville 50 50
  113 King City-Oasis Rd. 57 57
  193 Pacific Grove 0 0
  129 Pajaro 18 18
  116 Salinas North 25 25
  214 Salinas South II 22 22
Napa 109 Carneros 117 117
  077 Oakville 108 108
Orange 075 Irvine 0 0
Placer 195 Auburn 27 27
Riverside 135 Blythe NE 12 12
  118 Cathedral City 0 0
  200 Indio 2 10 10
  208 La Quinta II 0 0
  238 Moreno Valley 9 9
  136 Oasis 0 0
  240 Perris 78 78
  151 Ripley 59 59
  062 Temecula 0 0
  237 Temecula East III 0 0
  218 Thermal South 43 43
  044 U.C. Riverside 0 0
  179 Winchester 67 67
Sacramento 131 Fair Oaks 44 44
  140 Twitchell Island 0 0
San Benito 126 San Benito 40 40
  143 San Juan Valley 47 47
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 423 233
  233 Joshua Tree 0 0
  192 Lake Arrowhead 353 266
  117 Victorville 132 125
San Diego 207 Borrego Springs 49 49
  153 Escondido SPV 76 76
  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 0 0
  070 Manteca 11 11
  167 Tracy 45 45
San Luis Obispo 163 Atascadero 115 109
  202 Nipomo 26 26
  052 San Luis Obispo 2 2
  160 San Luis Obispo West 2 2
Santa Barbara 088 Cuyama 149 143
  094 Goleta Foothills 0 0
  231 Lompoc 0 0
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 0 0
  064 Santa Ynez 111 105
  165 Sisquoc 52 52
Santa Clara 211 Gilroy 64 64
Santa Cruz 104 De Laveaga 36 36
  209 Watsonville West II 5 5
Shasta 043 McArthur 395 268
  224 Shasta College 105 96
Siskiyou 091 Tulelake FS 430 287
Solano 121 Dixon 169 169
  212 Hastings Tract East 79 79
  139 Winters 86 86
Sonoma 158 Bennett Valley 145 145
  144 Petaluma East 220 217
  083 Santa Rosa 150 149
  103 Windsor 152 152
Stanislaus 206 Denair 49 49
  071 Modesto 86 86
  194 Oakdale 64 64
  161 Patterson 77 77
Sutter 235 Verona 58 58
Tehama 008 Gerber 0 0
Tulare 203 Alpaugh 96 95
  182 Delano 62 62
  086 Lindcove 27 27
  169 Porterville 82 82
Ventura 152 Camarillo 2 2
  156 Oxnard 4 4
  198 Santa Paula 77 59
Yolo 155 Bryte 0 0
  006 Davis 12 12
  196 Esparto 13 13
  226 Woodland 0 0
Yuba 084 Browns Valley 23 23
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