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 Portions - Select Station from List

County Station Portions
Alameda 191 Pleasanton 43
  171 Union City 49
Amador 227 Plymouth 52
Butte 244 Biggs 47
  012 Durham 49
Colusa 250 Williams 46
Contra Costa 047 Brentwood 41
  170 Concord 44
  213 El Cerrito 47
  178 Moraga 45
El Dorado 013 Camino 50
  228 Diamond Springs 48
Fresno 205 Coalinga 41
  007 Firebaugh/Telles 41
  190 Five Points South West 38
  002 FivePoints/WSFS USDA 40
  080 Fresno State 38
  142 Orange Cove 40
  124 Panoche 41
  039 Parlier 43
  105 Westlands 42
Imperial 041 Calipatria/Mulberry 23
  087 Meloland 22
  175 Palo Verde II 32
  128 Salton Sea East 0
  127 Salton Sea West 0
  068 Seeley 24
  201 UC-Andrade 0
  186 UC-San Luis 0
  181 Westmorland North 22
Inyo 035 Bishop 45
  183 Owens Lake North 48
  189 Owens Lake South 48
Kern 125 Arvin-Edison 38
  146 Belridge 37
  054 Blackwells Corner 43
  005 Shafter/USDA 39
Kings 021 Kettleman 0
  015 Stratford 40
Lassen 057 Buntingville 61
Los Angeles 216 Arleta 22
  215 Chatsworth 21
  133 Glendale 0
  174 Long Beach 5
  159 Monrovia 22
  197 Palmdale 43
  220 Palmdale Central 43
  078 Pomona 24
  204 Santa Clarita 27
  099 Santa Monica 12
  219 West Hills 23
Madera 145 Madera 0
  188 Madera II 0
Marin 187 Black Point 46
  157 Point San Pedro 49
Mendocino 085 Hopland FS 0
  106 Sanel Valley 6
Merced 092 Kesterson 46
  056 Los Banos 43
  148 Merced 46
Modoc 090 Alturas 73
Monterey 114 Arroyo Seco 37
  210 Carmel 33
  019 Castroville 37
  113 King City-Oasis Rd. 37
  193 Pacific Grove 38
  129 Pajaro 42
  116 Salinas North 41
  214 Salinas South II 36
Napa 109 Carneros 44
  077 Oakville 44
Orange 245 Coto de Caza 25
  075 Irvine 16
  241 San Clemente 25
Placer 195 Auburn 22
Riverside 135 Blythe NE 28
  118 Cathedral City 0
  239 Hemet 30
  200 Indio 2 14
  208 La Quinta II 18
  238 Moreno Valley 0
  136 Oasis 12
  240 Perris 25
  151 Ripley 32
  062 Temecula 20
  237 Temecula East III 23
  218 Thermal South 17
  044 U.C. Riverside 22
  179 Winchester 33
Sacramento 131 Fair Oaks 44
  140 Twitchell Island 43
San Benito 126 San Benito 35
  143 San Juan Valley 42
San Bernardino 134 Barstow NE 0
  199 Big Bear Lake 69
  233 Joshua Tree 42
  192 Lake Arrowhead 69
  234 Newberry Springs II 40
  117 Victorville 44
San Diego 207 Borrego Springs 21
  153 Escondido SPV 13
  150 Miramar 18
  147 Otay Lake 18
  184 San Diego II 12
  173 Torrey Pines 13
San Joaquin 166 Lodi West 0
  070 Manteca 41
  167 Tracy 0
San Luis Obispo 163 Atascadero 39
  202 Nipomo 25
  052 San Luis Obispo 25
  160 San Luis Obispo West 29
Santa Barbara 088 Cuyama 40
  094 Goleta Foothills 0
  231 Lompoc 28
  107 Santa Barbara 14
  230 Santa Barbara II 0
  232 Santa Maria II 20
  064 Santa Ynez 28
  165 Sisquoc 28
Santa Clara 211 Gilroy 35
Santa Cruz 104 De Laveaga 41
  209 Watsonville West II 48
Shasta 043 McArthur 70
  224 Shasta College 44
Siskiyou 236 Macdoel II 69
  225 Scott Valley 60
  091 Tulelake FS 73
Solano 121 Dixon 45
  212 Hastings Tract East 46
  139 Winters 47
Sonoma 158 Bennett Valley 47
  144 Petaluma East 47
  083 Santa Rosa 45
  103 Windsor 43
Stanislaus 206 Denair 44
  071 Modesto 43
  194 Oakdale 46
  161 Patterson 0
Sutter 235 Verona 44
Tehama 008 Gerber 0
  222 Gerber South 47
Tulare 203 Alpaugh 0
  182 Delano 40
  086 Lindcove 44
  169 Porterville 46
Ventura 152 Camarillo 23
  217 Moorpark 20
  156 Oxnard 0
  198 Santa Paula 21
Yolo 155 Bryte 47
  006 Davis 46
  196 Esparto 0
  226 Woodland 44
Yuba 084 Browns Valley 43
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