Why December Is the Perfect Month to Run Your First 10K — + Races You Can Join

If you’ve been thinking about stepping up from 5K to 10K, December might actually be the best month of the year to do it. Cooler temperatures, festive races, and achievable training windows make this period ideal for your first 10-kilometre challenge.

Here’s why December is the perfect time to debut your first 10K — plus a selection of real events happening across Portugal that are great for beginners.

1) Cool weather makes running easier

Lower temperatures help keep your effort steady and your breathing comfortable.
For first-time 10K runners, this means:

• less fatigue
• better pacing
• lower risk of overheating
• a more enjoyable overall experience

Winter weather is your secret ally.

2) December is full of festive 10K races — perfect for beginners

The atmosphere of São Silvestres and Winter Runs makes the first 10K feel less intimidating and much more fun.
Here are some excellent events happening this month:

🔵 São Silvestre de Beja

📅 Friday, 26 December 2025
📍 Beja
A classic Alentejo road race with a friendly atmosphere and a beginner-friendly 10K course.

🔵 Cherry Winter Run – Paul

📅 Saturday, 13 December 2025
📍 Covilhã
A winter-themed race in the mountains, perfect for a cool, scenic and motivating 10K debut.

🔵 São Silvestre de Boticas

📅 Saturday, 20 December 2025
📍 Boticas
A northern race with a calm setting, ideal for first-timers who prefer a smaller, community-driven event.

🔵 São Silvestre da Camarneira

📅 Saturday, 20 December 2025
📍 Camarneira
Fast, festive and welcoming — great for runners who want a simple and stress-free 10K.

🔵 São Silvestre El Corte Inglés

📅 Sunday, 14 December 2025
📍 Lisbon
One of Portugal’s most iconic races, with thousands of participants and a beginner-friendly course across the heart of the city.

3) Motivation is naturally higher in December

Running a 10K at the end of the year creates a unique sense of momentum and achievement. It helps you:

• finish the year with a clear goal
• start January already in a good rhythm
• avoid the “New Year’s pressure” to begin later

Instead of waiting for January, you build motivation right now.

4) 10K training fits perfectly into a December routine

A realistic 10K plan only requires:

• 2 easy runs per week
• 1 longer run
• 30–45 min per session

Even with social events, holidays and busy schedules, training remains manageable.

5) 10K is the ideal next step after 5K

The 10K distance is challenging enough to feel like real progress — but still accessible for most beginner runners.

It requires consistency, not perfection.
Structure, not long hours.
Motivation, not advanced fitness.

This is why so many runners describe the 10K as the distance that truly transforms their running journey.

6) A meaningful achievement to close your year

Finishing your first 10K in December is a powerful way to wrap up the year with confidence and start the next one with purpose.

If your goal is to progress in running, gain motivation or simply try something new, December is the perfect month to run your first 10K.
Cool weather, festive races and manageable training make everything easier — and more fun.

👉 Explore beginner-friendly 10K races on RaceFinder