3rd Grade STEM Projects | Full-Year Engineering Activities

🔬 Grade 3 STEM Projects | 6 Capstones + 12 Mini-Projects

Bring meaningful Grade 3 STEM projects into your classroom with investigations that move beyond simple building activities. This resource gives students structured opportunities to design, test, analyze data, revise ideas, and defend their conclusions.

📦 What’s Included

18 complete STEM projects:

• ⭐ 6 major capstone projects

• 🔬 12 standalone mini-projects

• 📊 Criteria, constraints, and a data plan for every project

• 📝 Teacher directions and student planning pages

• 📈 Student results and data-recording pages

• ✅ Project rubrics and self-assessment opportunities

• 👥 Team-based and individual investigation formats

• 🎤 Peer review, presentations, panels, and showcase activities

The six major projects are extended, project-based versions of each unit's capstone challenge from the Grade 3 STEM Curriculum. The twelve mini-projects are new and stand alone.

Major Capstones Include:

• The Engineering Challenge

• The Vehicle Grand Prix

• The Solar Cooker Challenge

• The Ecosystem Investigation

• The Hazard Summit

• STEM Investigators Showcase

The capstones intentionally reuse builds and data from earlier units. The final showcase brings together learning from the entire Grade 3 STEM year.

Mini-Projects Include:

• The Replication Study

• The Outlier Hunt

• Bridge Efficiency Rematch

• Paper Aeroplane Lab

• The Pendulum Investigation

• The Insulation Optimisation

• Design a Packaging Solution

• The Germination Rate Study

• The Biodiversity Survey

• The Shadow Clock

• The Sound Insulation Lab

• The Energy Audit

🏫 How It Works in the Classroom

Use these Grade 3 STEM projects as unit-ending capstones or flexible mini-projects.

Major projects run across five sessions. Students generally work in teams of three or four.

Mini-projects run across three sessions. They work well during spare weeks or as challenge replacements.

Students are guided through authentic STEM practices:

• Ask questions

• Research and imagine solutions

• Plan investigations

• Build and test

• Collect meaningful data

• Analyze results

• Revise designs

• Complete peer review

• Communicate evidence-based conclusions

The projects emphasize the idea that every investigation should end with useful numbers and evidence.

🎯 Standards & Learning Goals

This resource supports Grade 3 students in developing practical skills related to:

• 🔎 Asking testable questions

• 🧪 Planning investigations

• 📊 Collecting and analyzing data

• 📈 Creating and interpreting graphs

• ⚙️ Designing, building, testing, and improving solutions

• 🔄 Identifying variables and controlling conditions

• 🧠 Using evidence to support claims

• 💬 Explaining reasoning

• 👥 Collaborating and participating in peer review

• 🎤 Communicating findings to an audience

The resource specifically builds toward independent investigation, including variables, repeated trials, graphs, claims, evidence, reasoning, and limitations.

⭐ Why Teachers Love It

Save planning time.

You get complete project structures instead of starting each STEM challenge from scratch.

Make STEM more meaningful.

Students don't simply build something. They collect evidence and explain what their data shows.

Build progression throughout the year.

The capstones deliberately connect with earlier Grade 3 STEM investigations.

Keep students engaged.

Students design, build, test, troubleshoot, collaborate, present, and defend their thinking.

Make learning visible.

Student data sheets, graphs, presentations, and display boards create tangible evidence of learning.

Support different learners.

Teacher notes include support and extension ideas for the major projects.

✨ Perfect For

• Grade 3 STEM classrooms

• Elementary science

• Engineering design challenges

• STEM centers and project-based learning

• Unit-ending assessments

• Enrichment weeks

• Collaborative investigations

• End-of-year STEM showcases

Give your students opportunities to think like engineers, investigate like scientists, and communicate like researchers.