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 10
  171 Union City 27
Amador 227 Plymouth 18
Butte 012 Durham 12
Colusa 250 Williams 13
Contra Costa 047 Brentwood 9
  170 Concord 12
  213 El Cerrito 17
  178 Moraga 16
El Dorado 013 Camino 21
  228 Diamond Springs 19
Fresno 205 Coalinga 6
  007 Firebaugh/Telles 9
  190 Five Points South West 7
  002 FivePoints/WSFS USDA 6
  080 Fresno State 8
  142 Orange Cove 8
  124 Panoche 10
  039 Parlier 9
  105 Westlands 5
Imperial 041 Calipatria/Mulberry 0
  087 Meloland 0
  175 Palo Verde II 0
  128 Salton Sea East 0
  127 Salton Sea West 0
  068 Seeley 0
  201 UC-Andrade 0
  186 UC-San Luis 0
  181 Westmorland North 0
Inyo 035 Bishop 17
  183 Owens Lake North 12
  189 Owens Lake South 9
Kern 125 Arvin-Edison 5
  146 Belridge 6
  054 Blackwells Corner 8
  005 Shafter/USDA 9
Kings 021 Kettleman 0
  015 Stratford 5
Lassen 057 Buntingville 35
Los Angeles 216 Arleta 0
  215 Chatsworth 0
  133 Glendale 0
  174 Long Beach 0
  159 Monrovia 0
  197 Palmdale 5
  220 Palmdale Central 6
  078 Pomona 0
  204 Santa Clarita 0
  099 Santa Monica 0
  219 West Hills 0
Madera 145 Madera 0
  188 Madera II 10
Marin 187 Black Point 10
  157 Point San Pedro 11
Mendocino 085 Hopland FS 0
  106 Sanel Valley 15
Merced 092 Kesterson 8
  056 Los Banos 7
  148 Merced 11
Modoc 090 Alturas 39
Monterey 114 Arroyo Seco 9
  210 Carmel 13
  019 Castroville 30
  113 King City-Oasis Rd. 6
  193 Pacific Grove 15
  129 Pajaro 10
  116 Salinas North 13
  214 Salinas South II 12
Napa 109 Carneros 13
  077 Oakville 13
Orange 245 Coto de Caza 0
  075 Irvine 0
  241 San Clemente 0
Placer 195 Auburn 11
Riverside 135 Blythe NE 0
  118 Cathedral City 0
  239 Hemet 2
  200 Indio 2 0
  208 La Quinta II 4
  238 Moreno Valley 0
  136 Oasis 0
  240 Perris 1
  151 Ripley 1
  062 Temecula 0
  237 Temecula East III 2
  218 Thermal South 0
  044 U.C. Riverside 0
  179 Winchester 1
Sacramento 131 Fair Oaks 10
  140 Twitchell Island 9
San Benito 126 San Benito 6
  143 San Juan Valley 10
San Bernardino 134 Barstow NE 0
  199 Big Bear Lake 34
  233 Joshua Tree 1
  192 Lake Arrowhead 27
  234 Newberry Springs II 3
  117 Victorville 0
San Diego 207 Borrego Springs 0
  153 Escondido SPV 1
  150 Miramar 0
  147 Otay Lake 1
  184 San Diego II 0
  173 Torrey Pines 0
San Joaquin 166 Lodi West 0
  070 Manteca 10
  167 Tracy 0
San Luis Obispo 163 Atascadero 11
  202 Nipomo 5
  052 San Luis Obispo 1
  160 San Luis Obispo West 3
Santa Barbara 088 Cuyama 14
  094 Goleta Foothills 0
  231 Lompoc 6
  107 Santa Barbara 6
  230 Santa Barbara II 0
  232 Santa Maria II 4
  064 Santa Ynez 4
  165 Sisquoc 10
Santa Clara 211 Gilroy 7
Santa Cruz 104 De Laveaga 12
  209 Watsonville West II 15
Shasta 043 McArthur 34
  224 Shasta College 15
Siskiyou 236 Macdoel II 37
  225 Scott Valley 34
  091 Tulelake FS 41
Solano 121 Dixon 15
  212 Hastings Tract East 18
  139 Winters 12
Sonoma 158 Bennett Valley 14
  144 Petaluma East 27
  083 Santa Rosa 13
  103 Windsor 13
Stanislaus 206 Denair 8
  071 Modesto 10
  194 Oakdale 10
  161 Patterson 10
Sutter 235 Verona 11
Tehama 008 Gerber 0
  222 Gerber South 11
Tulare 203 Alpaugh 9
  182 Delano 1
  086 Lindcove 7
  169 Porterville 8
Ventura 152 Camarillo 1
  217 Moorpark 0
  156 Oxnard 0
  198 Santa Paula 0
Yolo 155 Bryte 9
  006 Davis 10
  196 Esparto 0
  226 Woodland 9
Yuba 084 Browns Valley 8
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