Chill Portions Requirements, Calculated using the Dynamic Model
Compiled by Katherine Pope, Orchard Advisor, UC Cooperative Extension
| Crop | Cultivar | Chill Portions |
| Almond | Desmayo Largueta1 | 28 |
| Ferragnes1 | 32 | |
| Nonpareil1,2 | 22-23 | |
| Apple | Golden Delicious3 | 50 |
| Apricot | Bergeron4,5 | 62-65 |
| Búlida4,5 | 54-56 | |
| Canino5 | 30-45 | |
| Currot4,6,5 | 34-40 | |
| Dorada4,5 | 56-58 | |
| Goldrich6 | 62 | |
| Murciana4,5 | 56 | |
| Orange Red4,5,6 | 55-69 | |
| Palsteyn5 | 32-37 | |
| Rojo Pasion4,5 | 48-51 | |
| San Castrese6 | 55 | |
| Selene4,5 | 57 | |
| Cherry | Brooks7 | 37 |
| Burlat3,7 | 48-53 | |
| Cristobalina7 | 30 | |
| Lapins3 | 35 | |
| Marvin7 | 58 | |
| New Star7 | 54 | |
| Rainier3 | 45 | |
| Ruby7 | 48 | |
| Sam3 | 70 | |
| Somerset7 | 48 | |
| Nectarine | Aprilglo3 | 12 |
| Fantasia8 | 42 | |
| Flavortop8 | 41 | |
| Mayglo3 | 18 | |
| Sunlite8 | 33 | |
| Peach | Andross9 | 63 |
| Big Top9 | 63 | |
| Earligrande3 | 12 | |
| Flordaprince3 | 8 | |
| Maravilha3 | 12 | |
| O’Henry9 | 63 | |
| Redhaven3 | 75 | |
| Pistachio | Kerman2,10 | 54-58 |
| Mateur11 | 36 | |
| Peters2,10 | 58-65 | |
| Sirora12 | 60 | |
| Prune | Improved French10 | 55-60 |
| Walnut | Chandler10 | 45-50 |
| Hartley13 | 54 | |
| Payne14 | 38 | |
Numbers next to cultivar name indicates information source.
1. Ramirez, L., K. X. Sagredo, et al. (2010). Prediction models for chilling and heat requirements to estimate full bloom of almond cultivars in the Central Valley of Chile. Acta Horticulturae 872: 107-112.
2. Pope, K., et al. (2014). Nut crop yield records show that budbreak-based chilling requirements may not reflect yield decline chill thresholds. International Journal of Biometeorology: 1-9.
3. Erez, A. (2000). Bud dormancy; phenomenon, problems and solutions in the tropics and subtropics. Temperate fruit crops in warm climates. A. Erez. Dordrecht, The Netherlands, Kluwer Academic Publishers: 17-48.
4. Ruiz, D., J. A. Campoy, et al. (2007). Chilling and heat requirements of apricot cultivars for flowering. Environmental and Experimental Botany 61: 254-263.
5. Campoy (2012) The fulfilment of chilling requirements and the adaptation of apricot (Prunus armeniaca L.) in warm winter climates: An approach in Murcia (Spain) and the Western Cape (South Africa)
6. Viti, R., L. Andreini, et al. (2010). Effect of climatic conditions on the overcoming of dormancy in apricot flower buds in two Mediterranean areas: Murcia (Spain) and Tuscany (Italy). Scientia Horticulturae. 124: 217-224.
7. Alburquerque, N., F. Garcia-Montiel, et al. (2008). Chilling and heat requirements of sweet cherry cultivars and the relationship between altitude and the probability of satisfying the chill requirements. Environmental and Experimental Botany 64: 162-170.
8. Linsley-Noakes, G. C. and P. Allan (1994). Comparison of two models for the prediction of rest completion in peaches. Scientia Horticulturae 59: 107-113.
9. Miranda (2013) Evaluation and fitting of models for determining peach phenological stages at a regional scale
10. Estimate based on chill accumulation in California’s Central Valley in the winter of 2013-2014, spring phenology and final yields.
11. Elloumi, O., M. Ghrab, et al. (2013). "Chilling accumulation effects on performance of pistachio trees cv. Mateur in dry and warm area climate." Scientia Horticulturae (Amsterdam) 159: 80-87.
12. Zhang, J. and C. Taylor (2011). "The Dynamic Model Provides the Best Description of the Chill Process on 'Sirora' Pistachio Trees in Australia." Hortscience 46(3): 420-425.
13. Luedeling, E., M. Zhang, et al. (2009). Validation of winter chill models using historic records of walnut phenology. Agricultural and Forest Meteorology 149: 1854-1864.
14. Luedeling, E., L. Guo, et al. (2013). "Differential responses of trees to temperature variation during the chilling and forcing phases." Agricultural and Forest Meteorology 181: 33-42.