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 884 792
  171 Union City 1098 1014
Amador 227 Plymouth 1222 1115
Butte 012 Durham 967 862
Colusa 250 Williams 907 807
Contra Costa 047 Brentwood 741 716
  170 Concord 978 906
  213 El Cerrito 590 438
  178 Moraga 1031 881
El Dorado 013 Camino 873 787
  228 Diamond Springs 812 752
Fresno 205 Coalinga 943 901
  007 Firebaugh/Telles 825 746
  190 Five Points South West 938 802
  002 FivePoints/WSFS USDA 996 844
  080 Fresno State 924 856
  142 Orange Cove 952 865
  124 Panoche 1010 880
  039 Parlier 977 909
  105 Westlands 992 834
Imperial 041 Calipatria/Mulberry 547 523
  087 Meloland 323 323
  175 Palo Verde II 763 655
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 413 411
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 353 352
Inyo 035 Bishop 1794 955
  183 Owens Lake North 1612 1147
  189 Owens Lake South 1666 1023
Kern 125 Arvin-Edison 851 805
  146 Belridge 905 835
  054 Blackwells Corner 1166 994
  005 Shafter/USDA 1019 858
Kings 021 Kettleman 0 0
  015 Stratford 965 845
Lassen 057 Buntingville 2306 1034
Los Angeles 216 Arleta 163 163
  215 Chatsworth 131 131
  133 Glendale 0 0
  174 Long Beach 282 282
  159 Monrovia 159 159
  197 Palmdale 1257 872
  220 Palmdale Central 986 819
  078 Pomona 301 296
  204 Santa Clarita 269 269
  099 Santa Monica 34 34
  219 West Hills 190 190
Madera 145 Madera 0 0
  188 Madera II 1480 1170
Marin 187 Black Point 994 860
  157 Point San Pedro 695 676
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1194 901
Merced 092 Kesterson 1183 927
  056 Los Banos 944 799
  148 Merced 1236 922
Modoc 090 Alturas 2351 1068
Monterey 114 Arroyo Seco 773 727
  210 Carmel 514 508
  019 Castroville 845 723
  113 King City-Oasis Rd. 868 777
  193 Pacific Grove 148 148
  129 Pajaro 463 444
  116 Salinas North 508 494
  214 Salinas South II 444 443
Napa 109 Carneros 1084 890
  077 Oakville 994 930
Orange 245 Coto de Caza 288 284
  075 Irvine 142 142
  241 San Clemente 294 290
Placer 195 Auburn 649 618
Riverside 135 Blythe NE 566 542
  118 Cathedral City 0 0
  239 Hemet 435 409
  200 Indio 2 224 224
  208 La Quinta II 351 332
  238 Moreno Valley 181 175
  136 Oasis 74 74
  240 Perris 516 471
  151 Ripley 651 604
  062 Temecula 137 128
  237 Temecula East III 171 171
  218 Thermal South 439 432
  044 U.C. Riverside 191 190
  179 Winchester 621 581
Sacramento 131 Fair Oaks 792 762
  140 Twitchell Island 744 719
San Benito 126 San Benito 794 755
  143 San Juan Valley 810 758
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2052 971
  233 Joshua Tree 955 845
  192 Lake Arrowhead 1786 1048
  234 Newberry Springs II 957 835
  117 Victorville 35 35
San Diego 207 Borrego Springs 468 443
  153 Escondido SPV 704 659
  150 Miramar 182 182
  147 Otay Lake 283 283
  184 San Diego II 54 54
  173 Torrey Pines 39 39
San Joaquin 166 Lodi West 0 0
  070 Manteca 1035 895
  167 Tracy 0 0
San Luis Obispo 163 Atascadero 1173 820
  202 Nipomo 245 245
  052 San Luis Obispo 240 240
  160 San Luis Obispo West 387 377
Santa Barbara 088 Cuyama 1256 999
  094 Goleta Foothills 0 0
  231 Lompoc 794 740
  107 Santa Barbara 148 148
  230 Santa Barbara II 10 10
  232 Santa Maria II 436 434
  064 Santa Ynez 893 664
  165 Sisquoc 902 770
Santa Clara 211 Gilroy 876 760
Santa Cruz 104 De Laveaga 470 465
  209 Watsonville West II 384 384
Shasta 043 McArthur 2334 1340
  224 Shasta College 1006 807
Siskiyou 236 Macdoel II 2422 1037
  225 Scott Valley 2308 1243
  091 Tulelake FS 2428 1079
Solano 121 Dixon 1377 905
  212 Hastings Tract East 1707 1218
  139 Winters 929 840
Sonoma 158 Bennett Valley 1148 1053
  144 Petaluma East 2341 1431
  083 Santa Rosa 1184 953
  103 Windsor 1076 929
Stanislaus 206 Denair 954 862
  071 Modesto 956 784
  194 Oakdale 983 927
  161 Patterson 227 189
Sutter 235 Verona 958 845
Tehama 008 Gerber 0 0
  222 Gerber South 926 835
Tulare 203 Alpaugh 283 231
  182 Delano 451 352
  086 Lindcove 1105 1025
  169 Porterville 1433 1137
Ventura 152 Camarillo 309 308
  217 Moorpark 146 146
  156 Oxnard 0 0
  198 Santa Paula 290 280
Yolo 155 Bryte 704 689
  006 Davis 811 774
  196 Esparto 0 0
  226 Woodland 747 715
Yuba 084 Browns Valley 544 515
Webmaster Email: fruitsandnuts@ucdavis.edu