Tree trimming prices can vary widely depending on factors like the size and type of trees, their condition, location, accessibility, and the complexity of the job. However, I can provide you with a general overview of tree trimming prices based on common industry standards in the United States:

1. **Hourly Rates**: Some tree trimming services charge by the hour. Rates typically range from $50 to $150 per hour, with the average being around $100 per hour.

2. **Per Tree Rates**: For smaller jobs or routine maintenance, tree trimming companies might charge per tree. Prices can vary greatly based on the height, species, and condition of the tree. On average, expect to pay anywhere from $100 to $1,000 per tree.

3. **Per Job Basis**: Larger projects or more complex trimming jobs may be priced on a per-job basis. Prices can range from $200 to $2,000 or more, depending on the scope of work.

4. **Factors Affecting Cost**: - Tree Height: Taller trees often require specialized equipment and more time, thus commanding higher prices. - Tree Diameter: Thicker branches may require more effort to trim, impacting the cost. - Tree Health: Diseased or damaged trees might require more careful trimming, affecting the price. - Location: Accessibility issues, such as trees near power lines or buildings, can increase the cost. - Additional Services: Extra services like stump removal or hauling away debris will add to the total cost.

5. **Emergency Services**: If you require immediate tree trimming due to storm damage or safety concerns, expect to pay a premium. Emergency services can cost significantly more than routine maintenance.

6. **Seasonal Variation**: Prices may fluctuate depending on the time of year. Tree trimming companies may be busier during certain seasons, impacting prices.

7. **Local Pricing**: Prices can vary based on your location and the prevailing market rates in your area. Urban areas and regions with a higher cost of living may have higher prices.

It's essential to obtain quotes from multiple tree trimming companies to compare prices and ensure you're getting a fair deal. Additionally, make sure to verify that the company is licensed, insured, and has a good reputation for quality workmanship and safety.