The National Space Weather Strategy and Action Plan (Strategy and Action Plan) identifies strategic objectives and high-level actions necessary to achieve a space-weather-ready Nation. Each action includes a proposed timeline for completion. The timelines are defined as short-term (six months to two years), medium-term (two to five years), long-term (five to ten years), and ongoing (expected to be repeated within the ten-year horizon). Each action includes a list of relevant agencies, with the recommended lead agency listed first, but does not prescribe a specific approach. Participation by additional agencies not listed will benefit many actions. To achieve the objectives identified in this strategy, the SWORM Working Group will develop an internal implementation plan with specific deliverables, timelines, and metrics for success. This strategy is intended to inform the policy development process. Any commitment of Federal resources to support the activities outlined in this document will be determined through the budget process. Strong coordination and collaboration across Federal agencies, the academic community, the private sector, and international allies and partners will improve America's ability to understand, forecast, and prepare for space weather events.