Top 5 Ranked Products
We analyzed millions of Amazon products to handpick the top recommendations just for you.

#1 Ranked
Scotts Turf Builder WinterGuard Fall Lawn Fertilizer for All Grass Types, 4,000 sq. ft., 10 lbs.
Price: $22.05
Rating: ★★★★★
ASIN: B0BGMM1FZV
Score: 94%
Overview:
Scotts Turf Builder WinterGuard Fall Lawn Fertilizer is designed to enhance the health and resilience of lawns during the critical fall season. This product specifically targets the recovery of grass that may have suffered from summer stresses such as heat, drought, and foot traffic. By building strong, deep roots, it prepares the lawn for a robust resurgence in the spring. The 10 lb. bag is engineered to cover up to 4,000 square feet, making it suitable for various lawn sizes and types.
The versatility of this fertilizer is a key feature, as it can be applied to any grass type and can be used on both wet and dry lawns. This flexibility allows homeowners to conveniently incorporate it into their lawn care routine during the fall, which is considered the optimal time for feeding grass. Overall, Scotts Turf Builder WinterGuard offers a comprehensive solution for lawn maintenance, promoting healthy growth and recovery.
Pros:
- Nutrient-Rich Formula: Delivers essential nutrients that help lawns recover from summer damage.
- Seasonal Application: Specifically designed for fall application, ensuring optimal results.
- Coverage Area: One bag covers up to 4,000 sq. ft., making it efficient for larger lawns.
Cons:
- Single Season Use: Primarily intended for fall, limiting its use throughout the year.
- Application Timing: Requires application in the fall, which may not align with all gardening schedules.
- Potential Overuse: Risk of over-fertilization if not applied according to guidelines, which can harm the lawn.

#2 Ranked
Scotts Turf Builder WinterGuard Fall Weed & Feed3, Weed Killer Plus Fall Fertilizer, 5,000 sq. ft., 14.29 lbs.
Price: $29.99
Rating: ★★★★☆
ASIN: B01N03AC7M
Score: 94%
Overview:
Scotts Turf Builder WinterGuard Fall Weed & Feed3 is a dual-purpose lawn care product designed to control weeds while providing essential nutrients to the grass in the fall. This product targets over 50 types of common lawn weeds, promoting healthier grass growth for a more vibrant lawn in the spring. With a coverage area of 5,000 square feet, it is suitable for medium to large lawns, making it a practical choice for homeowners looking to enhance their lawn's health and appearance.
The application process is straightforward, as it is recommended to apply the product to a wet lawn when temperatures are consistently between 60°F and 90°F, ensuring optimal absorption. However, it is crucial to note that this product should not be used on certain grass types such as St. Augustinegrass and Bentgrass, which may limit its applicability for some users. Overall, Scotts Turf Builder WinterGuard Fall Weed & Feed3 offers a comprehensive solution for fall lawn care, combining weed control and fertilization in one product.
Pros:
- Weed Control: Effectively kills over 50 types of common lawn weeds.
- Nutrient-Rich: Provides essential nutrients to promote grass health for spring growth.
- Wide Coverage: One bag covers up to 5,000 square feet, making it suitable for larger lawns.
Cons:
- Limited Grass Types: Cannot be applied to certain grass varieties like St. Augustinegrass and Bentgrass.
- Temperature Sensitivity: Requires specific temperature conditions for effective application.
- Application Timing: Must be applied during a narrow window for optimal results, which may be inconvenient for some users.

#3 Ranked
True Organic Liquid Lawn Fertilizer 32 oz - CDFA, OMRI Listed for Organic Gardening NPK 4-0-1
Price: $12.99
Rating: ★★★★☆
ASIN: B08VGYM28T
Score: 94%
Overview:
The True Organic Liquid Lawn Fertilizer is a 32 oz liquid fertilizer designed specifically for organic gardening, boasting an NPK ratio of 4-0-1. This product is certified by the California Department of Food and Agriculture (CDFA) and is also OMRI Listed, ensuring its compliance with organic farming standards. It is formulated to promote rapid green-up of lawns and can cover up to 2,000 square feet when applied monthly. The fertilizer is made entirely from 100% organic and natural ingredients, making it safe for pets and environmentally friendly. Additionally, it is manufactured in the USA, which emphasizes its commitment to high-quality, ethically sourced plant food.
The product's unique selling point lies in its premium organic content, which promises to regenerate soil health and enhance the growth of fruits and vegetables. With a focus on clean sourcing and rigorous testing for pathogens, True Organic positions itself as a leader in the organic fertilizer market. The emphasis on farm-to-table practices further appeals to environmentally conscious consumers who prioritize sustainability in their gardening practices.
Pros:
- Organic Certification: CDFA and OMRI Listed, ensuring compliance with organic gardening standards.
- Pet Friendly: Made with 100% organic ingredients, safe for pets and the environment.
- Wide Coverage: One bottle covers up to 2,000 sq ft, making it efficient for lawn care.
Cons:
- Limited Nutrient Ratio: The NPK ratio of 4-0-1 may not meet all nutrient needs for diverse plants.
- Monthly Application: Requires regular monthly application, which may be inconvenient for some users.
- Size Limitation: The 32 oz bottle may not be sufficient for larger lawns or extensive gardening needs.

#4 Ranked
Scotts Turf Builder THICK'R LAWN Grass Seed, Fertilizer, and Soil Improver for Sun & Shade, 4,000 sq. ft., 40 lbs.
Price: $56.39
Rating: ★★★★☆
ASIN: B074P1578H
Score: 86%
Overview:
Scotts Turf Builder THICK'R LAWN is a comprehensive lawn care solution designed to enhance the health and appearance of your lawn. This product combines grass seed, fertilizer, and soil improver into a single formula, making it convenient for homeowners looking to achieve a lush, green lawn. Specifically formulated for both sun and shade areas, it promises to thicken lawns by up to 50% with proper application and care, addressing common issues like thin or patchy grass.
The 40-pound bag covers an impressive 4,000 square feet, making it suitable for medium to large lawns. The inclusion of soil improver aids in root development, which is crucial for the overall health of the grass. By applying this product in the spring and again in late summer or early fall, users can maximize their lawn's potential and enjoy a vibrant outdoor space.
Pros:
- 3-in-1 Formula: Combines grass seed, fertilizer, and soil improver for comprehensive lawn care.
- Thicker Lawn: Promises up to 50% thicker grass with proper application, improving lawn density.
- Wide Coverage: A single 40 lb. bag covers 4,000 sq. ft., making it economical for larger areas.
Cons:
- Variable Results: Effectiveness may vary based on the current condition of the lawn and environmental factors.
- Application Timing: Requires specific timing for application to achieve optimal results, which may not be convenient for all users.
- Limited Sun/Shade Adaptability: While designed for sun and shade, some grass types may not thrive equally in both conditions.

#5 Ranked
Scotts Liquid Green Max Lawn Food: 2,000 sq. ft., 2-in-1 Fertilizer and Iron Supplement, Use on Any Grass Type, 32 oz.
Price: $23.48
Rating: ★★★★☆
ASIN: B0BZN5843P
Score: 84%
Overview:
Scotts Liquid Green Max Lawn Food is a convenient and effective solution designed to enhance the appearance and health of your lawn. This 2-in-1 fertilizer and iron supplement is formulated to deliver visible results in just three days, making it ideal for homeowners looking to quickly green up their lawns before outdoor gatherings. The product is suitable for all grass types, providing versatility for users with different lawn varieties. Its easy application method allows for hassle-free use, ensuring that even novice gardeners can achieve a lush, vibrant lawn with minimal effort.
The dual-action formula not only nourishes the grass but also enriches it with iron, promoting a deeper green color that enhances curb appeal. Regular use from early spring through late fall can lead to a healthier lawn that contributes positively to the environment by improving air quality and reducing soil erosion. The ability to cover up to 2,000 square feet with a simple hose attachment further adds to its user-friendly design, making lawn care accessible to everyone.
Pros:
- Quick Results: Visible greening in just 3 days, perfect for last-minute outdoor events.
- Versatile Application: Suitable for any grass type, accommodating diverse lawn needs.
- Easy to Use: Simple hose attachment for effortless application without the need for spreaders.
Cons:
- Limited Coverage: While it covers 2,000 sq. ft., larger lawns may require multiple bottles.
- Seasonal Use: Best results are achieved only when used regularly during specific seasons.
- Liquid Form: Some users may prefer granular fertilizers for ease of storage and application.
Product Information & Tips
Overview
When searching for the best lawn fertilizer for Colorado, it is essential to consider the unique climate and soil conditions of the region. Colorado's diverse elevation and varying weather patterns impact the types of grass that thrive, requiring specific nutrient profiles to promote healthy growth. Fertilizers must be tailored to support the local flora while also addressing common issues such as drought and nutrient depletion.
Additionally, the timing of fertilizer application is crucial in Colorado due to its short growing season. Homeowners need to select fertilizers that not only provide immediate benefits but also support long-term health. Understanding the types of fertilizers available—such as organic versus synthetic—can also help in making informed decisions that align with both environmental and aesthetic goals.
Key Criteria
1. Nutrient Composition:
- Fertilizers must contain the right balance of nitrogen (N), phosphorus (P), and potassium (K) to support the specific grass types common in Colorado, such as Kentucky bluegrass, fescue, and ryegrass.
2. Soil pH Compatibility:
- Colorado soils can vary widely in pH. A good fertilizer should enhance soil health and nutrient availability, ensuring that it is effective regardless of local soil conditions.
3. Release Type (Slow vs. Fast):
- The choice between slow-release and fast-release fertilizers affects how nutrients are absorbed by plants. Slow-release options are often more beneficial in Colorado's climate, providing a steady supply of nutrients over time.
4. Environmental Impact:
- Given Colorado's focus on sustainability, selecting fertilizers that are environmentally friendly and reduce runoff is important for protecting local ecosystems.
5. Application Timing:
- Understanding the best times to apply fertilizer can significantly impact lawn health. Fertilizers should be applied during the optimal growing seasons in Colorado, typically in spring and fall.
Frequently Asked Questions
Q1: What type of grass is best for Colorado lawns?
A1: Kentucky bluegrass, perennial ryegrass, and tall fescue are commonly recommended due to their adaptability to Colorado's climate and soil conditions.
Q2: When is the best time to fertilize in Colorado?
A2: The best times to fertilize in Colorado are usually in early spring and early fall, coinciding with the active growing periods for most grass types.
Q3: Can I use organic fertilizers in Colorado?
A3: Yes, organic fertilizers can be effective in Colorado, particularly those that improve soil health and moisture retention, which is crucial in drier conditions.
Q4: How often should I fertilize my lawn in Colorado?
A4: Generally, fertilizing two to three times a year is sufficient, with applications in spring and fall being the most beneficial.
Q5: What is the importance of soil testing before fertilization?
A5: Soil testing helps determine nutrient deficiencies and pH levels, allowing for more targeted and effective fertilizer applications tailored to specific lawn needs.
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