When to Plant Watermelon in Arizona: Best Months and Last Planting Date
Plant watermelon in Arizona in February to March in the low desert, May to June at elevation. See region dates plus the midsummer second-crop window.
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When to Plant Watermelon in Arizona
Plant watermelon in Arizona after frost danger has passed and soil is at least 65 degrees F. Arizona ranges from hot low-desert areas around Phoenix and Yuma to cooler high desert and mountain areas around Flagstaff, so timing varies widely across the state.
Low desert Arizona can often plant in February or March, so flowers can turn into fruit before the worst summer heat. Mid-elevation areas usually fit March to April. High desert and mountain areas may need May or early June. Use the watermelon by zone guide with your local frost date and soil temperature.
Arizona Timing Notes
- In the low desert, plant early enough that flowering happens before peak summer heat, which can stop flowers from becoming fruit.
- In cooler areas, wait until nights are mild and soil is warm.
- Mulch and drip irrigation help keep soil moisture steady in dry heat.
- Give watermelon full sun and enough room for vines to spread.
Is It Too Late to Plant Watermelon in Arizona?
In the low desert, midsummer opens a second window: planting in July, around the start of monsoon moisture, produces a fall crop that ripens in October before the December frost. Skip the worst of June heat and keep young vines shaded and watered. At mid elevations, early July is the cutoff with a short-season variety. In the high country around Flagstaff, mid June is realistically the last call.
Next Steps
Check your local last frost date and soil temperature. In Arizona, matching planting to your elevation and heat pattern matters more than any statewide date.