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 20
  171 Union City 25
Amador 227 Plymouth 24
Butte 244 Biggs 20
  012 Durham 22
Colusa 250 Williams 19
Contra Costa 047 Brentwood 16
  170 Concord 18
  213 El Cerrito 22
  178 Moraga 20
El Dorado 013 Camino 22
  228 Diamond Springs 22
Fresno 205 Coalinga 18
  007 Firebaugh/Telles 19
  190 Five Points South West 16
  002 FivePoints/WSFS USDA 17
  080 Fresno State 15
  142 Orange Cove 15
  124 Panoche 19
  039 Parlier 18
  105 Westlands 19
Imperial 041 Calipatria/Mulberry 6
  087 Meloland 4
  175 Palo Verde II 12
  128 Salton Sea East 0
  127 Salton Sea West 0
  068 Seeley 3
  201 UC-Andrade 0
  186 UC-San Luis 0
  181 Westmorland North 3
Inyo 035 Bishop 21
  183 Owens Lake North 24
  189 Owens Lake South 24
Kern 125 Arvin-Edison 16
  146 Belridge 15
  054 Blackwells Corner 17
  005 Shafter/USDA 18
Kings 021 Kettleman 0
  015 Stratford 18
Lassen 057 Buntingville 37
Los Angeles 216 Arleta 5
  215 Chatsworth 5
  133 Glendale 0
  174 Long Beach 0
  159 Monrovia 6
  197 Palmdale 19
  220 Palmdale Central 18
  078 Pomona 6
  204 Santa Clarita 8
  099 Santa Monica 1
  219 West Hills 6
Madera 145 Madera 0
  188 Madera II 0
Marin 187 Black Point 21
  157 Point San Pedro 23
Mendocino 085 Hopland FS 0
  106 Sanel Valley 6
Merced 092 Kesterson 20
  056 Los Banos 18
  148 Merced 22
Modoc 090 Alturas 48
Monterey 114 Arroyo Seco 14
  210 Carmel 12
  019 Castroville 20
  113 King City-Oasis Rd. 15
  193 Pacific Grove 20
  129 Pajaro 22
  116 Salinas North 20
  214 Salinas South II 16
Napa 109 Carneros 21
  077 Oakville 20
Orange 245 Coto de Caza 7
  075 Irvine 3
  241 San Clemente 7
Placer 195 Auburn 2
Riverside 135 Blythe NE 6
  118 Cathedral City 0
  239 Hemet 10
  200 Indio 2 3
  208 La Quinta II 4
  238 Moreno Valley 0
  136 Oasis 1
  240 Perris 9
  151 Ripley 10
  062 Temecula 5
  237 Temecula East III 8
  218 Thermal South 4
  044 U.C. Riverside 5
  179 Winchester 12
Sacramento 131 Fair Oaks 20
  140 Twitchell Island 18
San Benito 126 San Benito 14
  143 San Juan Valley 19
San Bernardino 134 Barstow NE 0
  199 Big Bear Lake 44
  233 Joshua Tree 19
  192 Lake Arrowhead 45
  234 Newberry Springs II 16
  117 Victorville 20
San Diego 207 Borrego Springs 5
  153 Escondido SPV 3
  150 Miramar 2
  147 Otay Lake 3
  184 San Diego II 1
  173 Torrey Pines 2
San Joaquin 166 Lodi West 0
  070 Manteca 18
  167 Tracy 0
San Luis Obispo 163 Atascadero 16
  202 Nipomo 10
  052 San Luis Obispo 9
  160 San Luis Obispo West 10
Santa Barbara 088 Cuyama 17
  094 Goleta Foothills 0
  231 Lompoc 12
  107 Santa Barbara 3
  230 Santa Barbara II 0
  232 Santa Maria II 7
  064 Santa Ynez 9
  165 Sisquoc 10
Santa Clara 211 Gilroy 15
Santa Cruz 104 De Laveaga 19
  209 Watsonville West II 25
Shasta 043 McArthur 45
  224 Shasta College 18
Siskiyou 236 Macdoel II 46
  225 Scott Valley 36
  091 Tulelake FS 48
Solano 121 Dixon 19
  212 Hastings Tract East 20
  139 Winters 20
Sonoma 158 Bennett Valley 23
  144 Petaluma East 22
  083 Santa Rosa 20
  103 Windsor 20
Stanislaus 206 Denair 19
  071 Modesto 20
  194 Oakdale 20
  161 Patterson 0
Sutter 235 Verona 20
Tehama 008 Gerber 0
  222 Gerber South 21
Tulare 203 Alpaugh 0
  182 Delano 14
  086 Lindcove 19
  169 Porterville 20
Ventura 152 Camarillo 4
  217 Moorpark 4
  156 Oxnard 0
  198 Santa Paula 3
Yolo 155 Bryte 22
  006 Davis 21
  196 Esparto 0
  226 Woodland 19
Yuba 084 Browns Valley 18
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