Answer: According to the vegetable planting guide from the University of Arizona Cooperative Extension office, these are the best times for sowing squash in the low desert:
Summer squash: after mid-February up to mid-April, and then again from mid-August to the end of August.
Winter squash: throughout March, and then again from mid-July to the end of July.
These are guidelines. Your microclimate and each year's weather can influence results.
Good luck with your squash!
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