Colorado State is unreasonably cold for developing palm trees. Colorado is comprised of mountains, lower regions, high fields, and desert lands. It has a semi-parched and snow-capped atmosphere depending upon your proximity to the mountains. 

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Outrageous climate is the normal here in Colorado. Winters are exceptionally cold and frigid with normal temperatures going from 16° to 43°F (– 9° to 6°C) in January. Summers are cool and dry with normal temperatures extending from 59° to 88°F (15° to 31°C) in July. The most noteworthy temperature recorded in Colorado was 118 °F (48 °C) a the least was −60 °F (−51 °C). 

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Colorado gets hail, lightning, rainstorms, and, twisters. Colorado USDA Hardiness zones territory from 2b to 6b. 

Palm Trees in Colorado 

Colorado is one of the coldest states in US. On account of the outrageous climate conditions, even the chilly hardiest palm trees are probably not going to endure. Needle palm is one of the hardiest palms and can endure temperatures down to - 15F. On the off chance that you can make a microclimate with temperatures sufficiently warm, you can develop palms anyplace. In any case, be sensible. 

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Needle Palm Tree – Zones 5b-11 (- 15 to - 10F)