Best Vegetables To Grow In New Mexico Fall : Short Day Fall Onion Selection

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New Mexico’s fall planting season takes advantage of the state’s warm days and cool nights, perfect for vegetables that prefer mild temperatures. When you’re looking for the best vegetables to grow in new mexico fall, you need crops that can handle the unique high-desert climate. The key is starting seeds or transplants in late summer so they mature during the crisp autumn months.

Fall gardening in New Mexico is a game-changer. You avoid the intense summer heat, and many pests fade away. Plus, a light frost can actually make some vegetables sweeter. Let’s get into exactly what grows well and how to make it happen.

Best Vegetables To Grow In New Mexico Fall

These vegetables thrive in the cooler temperatures and shorter daylight hours of a New Mexico autumn. They are your best bets for a productive fall harvest.

Leafy Greens For Quick Harvests

Leafy greens are the superstars of fall gardening. They grow fast and tolerate light frosts well.

  • Spinach: Plant spinach 6-8 weeks before the first frost. It loves cool weather and can survive temperatures down to 20°F. Harvest outer leaves for continuous growth.
  • Kale: Kale gets sweeter after a frost. It’s incredibly hardy and can be picked well into winter. Varieties like ‘Lacinato’ and ‘Winterbor’ perform great.
  • Lettuce: Choose loose-leaf or romaine types. They mature in 45-60 days. Provide some shade if late September is still warm.
  • Swiss Chard: This colorful green is heat-tolerant but also thrives in fall. It produces for months if you keep picking the outer stalks.
  • Arugula: For a peppery kick, arugula grows in just 30-40 days. It bolts quickly in heat, so fall is perfect.

Root Vegetables That Store Well

Root crops are ideal for fall because they develop sweetness as soil temperatures drop. They also store nicely for winter use.

  1. Carrots: Sow seeds directly in late July or August. They need loose, sandy soil. Harvest after a frost for extra sweetness. ‘Nantes’ and ‘Danvers’ types work well.
  2. Beets: Plant beet seeds 8-10 weeks before frost. Both the roots and greens are edible. ‘Detroit Dark Red’ is a reliable choice.
  3. Radishes: These are the fastest crop. Some varieties mature in 25 days. Plant small batches every two weeks for a steady supply.
  4. Turnips: Grow them for both roots and greens. ‘Purple Top White Globe’ is classic. They handle light freezes without issue.
  5. Parsnips: These need a long season but are worth it. They taste best after several frosts. Plant in early August for a late fall harvest.

Brassicas For Cold Tolerance

The cabbage family loves cool weather. Many can survive snow and keep producing.

  • Broccoli: Set out transplants in late July. It forms heads best when nights are cool. ‘Green Goliath’ is heat-tolerant for early fall.
  • Cauliflower: This is trickier but doable. It needs consistent moisture and cool temps. ‘Snow Crown’ is a good variety for New Mexico.
  • Cabbage: Start seeds indoors or buy transplants. Cabbage heads store well in a cool place. ‘Early Jersey Wakefield’ matures quickly.
  • Brussels Sprouts: These need a long season (90-100 days). Plant in early July for a harvest after frost. The sprouts taste better cold.
  • Kohlrabi: This odd-looking veggie grows fast and tastes like a mild turnip. Harvest when bulbs are 2-3 inches wide.

Alliums For Flavor

Onions and their relatives are fall-friendly. Some are planted in fall for spring harvest, but others work as quick crops.

  • Green Onions: Also called scallions. Plant seeds or sets in late summer. They mature in 60 days and you can pull them as needed.
  • Garlic: Actually planted in October for harvest next June. Break bulbs into cloves and plant pointy-end up. ‘Softneck’ types store longest.
  • Leeks: These are slow but cold-hardy. Plant transplants in July. They can stay in the ground all winter in most New Mexico areas.

When To Plant Fall Vegetables In New Mexico

Timing is everything. New Mexico has varied climates from high mountains to low deserts. Your planting dates depend on your elevation and first frost date.

Find Your First Frost Date

Most of New Mexico sees first frost between mid-September and mid-October. Higher elevations frost earlier. Lower elevations like Las Cruces may frost in November.

  • Check your local extension office for exact dates.
  • Count backward from your first frost date.
  • Add 10-14 days for “buffer” in case of early frost.

General Planting Windows

Here are rough guidelines for different regions. Adjust based on your microclimate.

  • Northern NM (Santa Fe, Taos, Los Alamos): Plant cool-season crops in late July to early August. First frost is usually late September.
  • Central NM (Albuquerque, Rio Rancho): Plant from early August to mid-August. First frost around mid-October.
  • Southern NM (Las Cruces, Alamogordo): Plant from mid-August to early September. First frost in November or even December.

Use Succession Planting

Don’t plant everything at once. Stagger your plantings every two weeks. This gives you a continuous harvest instead of a glut.

For example, plant a row of radishes every 14 days from August through September. You’ll have fresh radishes for months.

Soil Preparation For Fall Gardens

Good soil is the foundation of a successful fall garden. New Mexico soil is often alkaline and low in organic matter.

Amend Your Soil

Before planting, add 2-3 inches of compost. This improves drainage and adds nutrients. Work it into the top 6-8 inches.

  • Use aged manure or bagged compost.
  • Add a balanced fertilizer like 10-10-10 at planting time.
  • Test your soil pH. Most vegetables prefer 6.0-7.0. New Mexico soil is often 7.5-8.0. Add sulfur to lower pH if needed.

Improve Drainage

New Mexico gets monsoon rains in late summer. Heavy clay soil can become waterlogged. Raised beds help immensely.

  • Build raised beds 6-12 inches high.
  • Mix in coarse sand or perlite for drainage.
  • Use drip irrigation to avoid wetting leaves.

Mulch For Moisture

Fall can still be dry. Mulch conserves water and keeps soil cool.

  • Apply 2-3 inches of straw, leaves, or wood chips.
  • Keep mulch away from plant stems to prevent rot.
  • Mulch also suppresses weeds that compete for nutrients.

Watering Strategies For Fall

Watering needs change as temperatures drop. Overwatering can cause rot in cool weather.

Adjust Your Schedule

In September, you might water every 2-3 days. By November, once a week may be enough.

  • Water deeply to encourage deep roots.
  • Check soil moisture 2 inches down. If dry, water.
  • Water in the morning so leaves dry before night.

Watch For Monsoon Rains

Late summer monsoons can dump a lot of water. Don’t water if rain is expected. Overly wet soil leads to fungal diseases.

  • Use a rain gauge to track precipitation.
  • Skip watering if you’ve gotten 1 inch of rain.
  • Ensure good drainage to prevent standing water.

Protecting Your Fall Garden From Frost

Frost is the biggest threat to fall vegetables. But you can easily protect them.

Use Row Covers

Lightweight fabric row covers add 4-6 degrees of protection. They let light and water through.

  • Drape covers over hoops or directly on plants.
  • Secure edges with rocks or soil.
  • Remove covers during the day if temps rise above 70°F.

Water Before Frost

Wet soil holds heat better than dry soil. Water your garden thoroughly the evening before a frost.

  • Moist soil releases heat slowly overnight.
  • This can raise the temperature around plants by a few degrees.
  • Don’t wet the leaves themselves.

Harvest Before Hard Freeze

Some vegetables can’t survive a hard freeze (below 28°F). Harvest tender crops like tomatoes and peppers before then.

  • Hardy greens like kale and spinach can survive.
  • Root vegetables can stay in ground with heavy mulch.
  • Bring in any nearly-mature produce.

Pest Management In Fall

Fall gardens have fewer pests than summer, but some still appear.

Common Fall Pests

  • Aphids: Small green or black insects on new growth. Spray with water or insecticidal soap.
  • Cabbage Worms: Green caterpillars on brassicas. Use floating row covers to prevent them.
  • Slugs and Snails: Come out in cool, damp weather. Hand-pick or use iron phosphate bait.
  • Harlequin Bugs: Colorful shield bugs on cabbage family. Remove by hand or use neem oil.

Preventive Measures

  • Rotate crops each year to avoid soil-borne diseases.
  • Remove plant debris after harvest.
  • Encourage beneficial insects like ladybugs.
  • Use companion planting. Marigolds repel many pests.

Harvesting And Storing Fall Vegetables

Knowing when and how to harvest maximizes your yield.

Harvest Timing

  • Leafy Greens: Pick outer leaves when they are 4-6 inches tall. Leave inner leaves to grow.
  • Root Vegetables: Pull when roots are full-sized but still tender. Carrots can stay in ground if mulched.
  • Brassicas: Harvest broccoli heads when tight. Cut cabbage when heads feel firm.

Storage Tips

  • Store root vegetables in a cool, dark place (32-40°F).
  • Remove greens from roots before storing.
  • Leafy greens keep in the fridge for 1-2 weeks.
  • Garlic and onions need dry, airy storage.

Fall Vegetable Varieties For New Mexico

Not all varieties are equal. Some handle New Mexico’s unique conditions better.

Top Recommended Varieties

  • Spinach: ‘Bloomsdale Longstanding’, ‘Space’
  • Kale: ‘Dwarf Siberian’, ‘Red Russian’
  • Carrots: ‘Bolero’, ‘Napoli’
  • Beets: ‘Early Wonder’, ‘Chioggia’
  • Broccoli: ‘Packman’, ‘Waltham 29’
  • Lettuce: ‘Black Seeded Simpson’, ‘Rouge d’Hiver’
  • Radishes: ‘Cherry Belle’, ‘French Breakfast’

Where To Buy Seeds

Local nurseries often carry varieties suited to New Mexico. Online sources like Johnny’s Selected Seeds and Baker Creek have good options.

  • Check seed packets for “days to maturity.”
  • Choose shorter-season varieties for fall.
  • Consider organic seeds for better resilience.

Common Mistakes In Fall Gardening

Avoid these pitfalls to ensure success.

Planting Too Late

If you plant too close to frost, vegetables won’t mature. Always count back from your frost date.

  • Add extra time for slower growth in cooler temps.
  • Use transplants instead of seeds for faster results.
  • Choose quick-maturing varieties (under 60 days).

Neglecting Soil Prep

Summer crops deplete soil nutrients. Always amend before fall planting.

  • Test soil and add needed amendments.
  • Don’t reuse soil from summer without refreshing it.
  • Add compost even if you used it in spring.

Overwatering In Cool Weather

Plants need less water as days shorten. Too much water causes root rot.

  • Reduce watering frequency as temperatures drop.
  • Check soil before watering.
  • Improve drainage if water pools.

Extending The Season Into Winter

With some simple structures, you can harvest fresh vegetables all winter.

Cold Frames

A cold frame is a box with a glass or plastic lid. It traps heat and protects plants.

  • Place it over hardy greens like spinach and kale.
  • Open the lid on sunny days to prevent overheating.
  • Close it at night to trap warmth.

Low Tunnels

Hoops covered with greenhouse plastic create a mini greenhouse.

  • Use PVC or metal hoops.
  • Cover with 4-6 mil clear plastic.
  • Ventilate on warm days.

Mulching Heavily

A thick layer of straw or leaves insulates soil. This keeps root vegetables from freezing.

  • Apply 6-12 inches of mulch over root crops.
  • Pull back mulch to harvest.
  • Replace mulch after harvesting.

Frequently Asked Questions

Can I Grow Tomatoes In The Fall In New Mexico?

Tomatoes are warm-season crops. They struggle in fall because they need heat to ripen. You might get a late harvest if you plant early-maturing varieties in July, but frost will likely kill them by October.

What Is The Easiest Vegetable To Grow In New Mexico Fall?

Radishes are the easiest. They germinate in 5 days and mature in 25-30 days. You can plant them multiple times. Kale and spinach are also very forgiving.

Should I Use Seeds Or Transplants For Fall Planting?

Transplants give you a head start, especially for slow crops like broccoli and cabbage. Seeds are fine for fast growers like radishes, lettuce, and carrots. For best results, use transplants for brassicas and seeds for roots and greens.

How Do I Protect My Garden From Early Frost?

Use row covers, cloches, or old bedsheets. Water the soil before a frost. Harvest tender crops if a hard freeze is forecast. Hardy greens can survive light frosts without protection.

Can I Grow Peas In The Fall In New Mexico?

Yes, peas are a cool-season crop. Plant them 8-10 weeks before first frost. They prefer cooler temperatures but don’t tolerate hard freezes. Choose snow or snap peas for faster harvests.

Final Tips For Fall Garden Success

Start small if you’re new to fall gardening. Pick 3-4 vegetables from the list above. Prepare your soil well and watch the weather closely.

Keep a garden journal. Note planting dates, frost dates, and what worked. This helps you improve each year.

Enjoy the process. There’s something special about harvesting fresh greens in November when the air is crisp. Your fall garden will reward you with flavor you can’t get from store-bought produce.

Remember that the best vegetables to grow in new mexico fall are the ones you’ll actually eat. Grow what you love, and you’ll stay motivated through the season.