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 59 59
Amador 227 Plymouth 108 108
Butte 012 Durham 68 68
Colusa 250 Williams 87 87
Contra Costa 047 Brentwood 37 37
  170 Concord 64 64
  213 El Cerrito 80 30
  178 Moraga 101 101
El Dorado 013 Camino 95 95
  228 Diamond Springs 66 66
Fresno 205 Coalinga 38 38
  007 Firebaugh/Telles 50 50
  190 Five Points South West 76 74
  002 FivePoints/WSFS USDA 76 76
  080 Fresno State 51 51
  142 Orange Cove 56 56
  124 Panoche 93 93
  039 Parlier 61 61
  105 Westlands 68 68
Imperial 041 Calipatria/Mulberry 3 3
  087 Meloland 0 0
  175 Palo Verde II 14 14
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 6 6
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 4 4
Inyo 035 Bishop 230 138
  183 Owens Lake North 130 129
  189 Owens Lake South 158 124
Kern 125 Arvin-Edison 21 21
  146 Belridge 40 40
  054 Blackwells Corner 44 44
  005 Shafter/USDA 58 58
Kings 021 Kettleman 0 0
  015 Stratford 60 60
Lassen 057 Buntingville 229 154
Los Angeles 216 Arleta 0 0
  215 Chatsworth 0 0
  133 Glendale 0 0
  174 Long Beach 1 1
  159 Monrovia 0 0
  197 Palmdale 85 72
  220 Palmdale Central 50 45
  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 124 109
Marin 187 Black Point 81 80
  157 Point San Pedro 57 57
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 77 66
Merced 092 Kesterson 106 104
  056 Los Banos 72 72
  148 Merced 134 122
Modoc 090 Alturas 354 263
Monterey 114 Arroyo Seco 68 68
  210 Carmel 69 69
  019 Castroville 275 184
  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 96 93
  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 11 11
  118 Cathedral City 0 0
  239 Hemet 9 9
  200 Indio 2 0 0
  208 La Quinta II 37 37
  238 Moreno Valley 0 0
  136 Oasis 0 0
  240 Perris 25 25
  151 Ripley 16 16
  062 Temecula 0 0
  237 Temecula East III 3 3
  218 Thermal South 6 6
  044 U.C. Riverside 0 0
  179 Winchester 35 35
Sacramento 131 Fair Oaks 33 33
  140 Twitchell Island 45 45
San Benito 126 San Benito 70 70
  143 San Juan Valley 78 78
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 242 170
  233 Joshua Tree 58 54
  192 Lake Arrowhead 172 144
  234 Newberry Springs II 27 24
  117 Victorville 0 0
San Diego 207 Borrego Springs 8 8
  153 Escondido SPV 33 33
  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 91 85
  202 Nipomo 1 1
  052 San Luis Obispo 9 9
  160 San Luis Obispo West 27 27
Santa Barbara 088 Cuyama 121 121
  094 Goleta Foothills 0 0
  231 Lompoc 30 30
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 16 16
  064 Santa Ynez 48 48
  165 Sisquoc 70 70
Santa Clara 211 Gilroy 70 70
Santa Cruz 104 De Laveaga 34 34
  209 Watsonville West II 17 17
Shasta 043 McArthur 318 255
  224 Shasta College 107 104
Siskiyou 236 Macdoel II 388 241
  225 Scott Valley 292 204
  091 Tulelake FS 387 265
Solano 121 Dixon 133 119
  212 Hastings Tract East 145 140
  139 Winters 80 80
Sonoma 158 Bennett Valley 92 91
  144 Petaluma East 250 217
  083 Santa Rosa 89 79
  103 Windsor 84 78
Stanislaus 206 Denair 68 68
  071 Modesto 80 80
  194 Oakdale 64 64
  161 Patterson 71 71
Sutter 235 Verona 64 64
Tehama 008 Gerber 0 0
  222 Gerber South 85 85
Tulare 203 Alpaugh 46 46
  182 Delano 0 0
  086 Lindcove 41 41
  169 Porterville 109 109
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
Webmaster Email: fruitsandnuts@ucdavis.edu