Spokane Plains Battlefield State Park, located in the state of Washington, is a historically significant site that offers visitors a chance to explore and learn about the region's past. Here is a summary of the park, including reasons to visit, points of interest, interesting facts, and the best time of year to plan a visit.

Reasons to Visit:
1. Historical Significance: The park commemorates the Battle of Spokane Plains, which took place on September 5, 1858, during the Yakima War. It provides an immersive experience to understand the tumultuous times that shaped the area.
2. Educational Experience: With interpretive displays, signs, and guided tours, visitors can delve into the history of the conflict, gain insights into the lives of Native American tribes, and understand the impact of westward expansion.
3. Outdoor Recreation: The park offers opportunities for walking, hiking, picnicking, and birdwatching, making it an excellent destination for outdoor enthusiasts.
4. Scenic Beauty: Surrounded by rolling plains, woodlands, and diverse flora and fauna, the park provides a picturesque setting for nature lovers and photographers.

Points of Interest:
1. Interpretive Displays: The Visitor Center showcases exhibits that detail the history of the Yakima War, the events leading up to the battle, and the aftermath.
2. Battle Site: Visitors can explore the battlefield and imagine the intense conflicts that occurred there. Interpretive signs provide insights into the battle's progression.
3. Trail System: The park features a network of trails, including the 1.5-mile Battlefield Loop, offering an opportunity to hike through the landscape and observe the natural beauty.

Interesting Facts:
1. The Battle of Spokane Plains was fought between U.S. Army forces led by Colonel George Wright and Native American tribes, primarily the Yakama, Palouse, and Spokane.
2. The battle resulted in a decisive victory for the U.S. Army, ending major Native American resistance in the region.
3. The park area was designated a Washington State Battlefield in 2007, recognizing its importance in state history.
4. The park is managed collaboratively by Spokane County and the Washington State Parks and Recreation Commission.

Best Time to Visit:
The ideal time to visit Spokane Plains Battlefield State Park is during the summer months, from June to September. The weather is generally pleasant, with temperatures ranging from the 70s to 90s Fahrenheit (20s to 30s Celsius). This period allows for comfortable exploration of the park's trails and outdoor activities. However, it's advisable to check the park's official website or contact the visitor center for the most up-to-date information and any seasonal closures.

Sources:
1. Washington State Parks and Recreation Commission: https://parks.state.wa.us/540/Spokane-Plains-Battlefield
2. National Park Service: https://www.nps.gov/nr/travel/wash/ssp.htm
3. Spokane County: https://www.spokanecounty.org/1391/Spokane-Plains-Battlefield-State-Park