Fruit & Nut Research and Information Center
Fruit & Nut Research and Information Center
Fruit & Nut Research and Information Center
University of California
Fruit & Nut Research and 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 778 703
  171 Union City 733 682
Amador 227 Plymouth 1436 1231
Butte 012 Durham 929 811
Colusa 032 Colusa 0 0
Contra Costa 047 Brentwood 645 631
  170 Concord 1285 1039
  213 El Cerrito 585 547
  178 Moraga 912 815
El Dorado 013 Camino 1292 1138
  228 Diamond Springs 1153 1100
Fresno 205 Coalinga 789 745
  007 Firebaugh/Telles 745 694
  190 Five Points South West 698 602
  002 FivePoints/WSFS USDA 785 686
  080 Fresno State 739 683
  142 Orange Cove 795 737
  124 Panoche 852 762
  039 Parlier 754 724
  105 Westlands 759 671
Imperial 041 Calipatria/Mulberry 422 411
  087 Meloland 252 251
  175 Palo Verde II 517 502
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 301 296
  201 UC-Andrade 0 0
  186 UC-San Luis 0 0
  181 Westmorland North 348 343
Inyo 035 Bishop 1861 1101
  183 Owens Lake North 1558 1173
  189 Owens Lake South 1479 980
Kern 125 Arvin-Edison 631 604
  146 Belridge 696 652
  054 Blackwells Corner 1112 827
  005 Shafter/USDA 804 758
Kings 021 Kettleman 444 395
  015 Stratford 763 683
Lassen 057 Buntingville 2216 998
Los Angeles 216 Arleta 129 129
  215 Chatsworth 107 107
  133 Glendale 0 0
  174 Long Beach 156 156
  159 Monrovia 187 187
  197 Palmdale 1159 907
  220 Palmdale Central 962 820
  078 Pomona 267 267
  204 Santa Clarita 310 310
  099 Santa Monica 41 41
  219 West Hills 69 69
Madera 145 Madera 0 0
  188 Madera II 1204 1004
Marin 187 Black Point 764 696
  157 Point San Pedro 632 611
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 1018 822
Merced 092 Kesterson 931 763
  056 Los Banos 800 724
  148 Merced 1033 780
Modoc 090 Alturas 2339 1078
Monterey 114 Arroyo Seco 621 604
  210 Carmel 593 587
  019 Castroville 422 421
  113 King City-Oasis Rd. 717 663
  193 Pacific Grove 200 200
  129 Pajaro 442 442
  116 Salinas North 544 541
  214 Salinas South II 480 476
Napa 109 Carneros 890 765
  077 Oakville 929 854
Orange 245 Coto de Caza 270 270
  075 Irvine 118 118
  241 San Clemente 239 239
Placer 195 Auburn 811 804
Riverside 135 Blythe NE 455 453
  118 Cathedral City 0 0
  239 Hemet 514 514
  200 Indio 2 189 189
  208 La Quinta II 514 426
  238 Moreno Valley 171 171
  136 Oasis 96 96
  240 Perris 364 361
  151 Ripley 464 459
  062 Temecula 43 42
  237 Temecula East III 367 367
  218 Thermal South 413 409
  044 U.C. Riverside 204 204
  179 Winchester 384 383
Sacramento 131 Fair Oaks 757 717
  140 Twitchell Island 720 707
San Benito 126 San Benito 679 644
  143 San Juan Valley 757 703
San Bernardino 134 Barstow NE 0 0
  199 Big Bear Lake 2223 995
  233 Joshua Tree 794 699
  192 Lake Arrowhead 2041 1471
  234 Newberry Springs II 839 721
  117 Victorville 840 694
San Diego 207 Borrego Springs 388 372
  153 Escondido SPV 464 441
  150 Miramar 115 115
  147 Otay Lake 67 67
  184 San Diego II 38 38
  173 Torrey Pines 15 15
San Joaquin 166 Lodi West 0 0
  070 Manteca 828 726
  167 Tracy 754 698
San Luis Obispo 163 Atascadero 739 613
  202 Nipomo 267 267
  052 San Luis Obispo 211 211
  160 San Luis Obispo West 405 405
Santa Barbara 088 Cuyama 1064 969
  094 Goleta Foothills 0 0
  231 Lompoc 500 480
  107 Santa Barbara 1261 1180
  230 Santa Barbara II 24 20
  232 Santa Maria II 407 399
  064 Santa Ynez 781 637
  165 Sisquoc 647 598
Santa Clara 211 Gilroy 649 601
Santa Cruz 104 De Laveaga 1155 1044
  209 Watsonville West II 435 435
Shasta 043 McArthur 2272 1226
  224 Shasta College 1103 926
Siskiyou 236 Macdoel II 2334 1108
  225 Scott Valley 2168 1183
  091 Tulelake FS 2356 1112
Solano 121 Dixon 1228 1100
  212 Hastings Tract East 1138 1009
  139 Winters 944 851
Sonoma 158 Bennett Valley 1123 948
  144 Petaluma East 2401 1655
  083 Santa Rosa 1000 859
  103 Windsor 1129 949
Stanislaus 206 Denair 768 711
  071 Modesto 825 734
  194 Oakdale 189 188
  161 Patterson 732 662
Sutter 235 Verona 925 843
Tehama 008 Gerber 0 0
  222 Gerber South 983 918
Tulare 203 Alpaugh 1284 919
  182 Delano 880 795
  086 Lindcove 737 717
  169 Porterville 1045 909
Ventura 152 Camarillo 231 231
  217 Moorpark 144 144
  156 Oxnard 96 96
  198 Santa Paula 413 379
Yolo 155 Bryte 780 767
  006 Davis 792 761
  196 Esparto 612 609
  226 Woodland 828 553
Yuba 084 Browns Valley 674 667
Webmaster Email: fruitsandnuts@ucdavis.edu