In Kansas, the best time to plant watermelons outdoors is approximately 2 weeks after the last spring frost date, when the soil temperature is warm enough for optimal growth, usually above 65°F. For major cities in Kansas, the average last frost dates range from around April 15 to April 25. Therefore, planting watermelon outdoors typically happens in late May to early June. Specifically:
- Start watermelon seeds indoors from April 15 to May 15.
- Transplant seedlings outdoors between May 25 and June 15.
- Ensure soil temperature is consistently warm (above 65°F).
- Space watermelon plants 36-42 inches apart with 60 inches between rows for good growth.
This timing aligns with Kansas' climate, ensuring the watermelon vines get the warm soil and temperature conditions they need to thrive and produce sweet fruit.
