When to Plant Pumpkin in Pittsburgh, Pennsylvania (15213)

Location

Pittsburgh, Pennsylvania

ZIP Code

15213

USDA Zone

Last Frost

Wednesday, April 15, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Wednesday, March 4, 2026

Based on last frost Wednesday, April 15, 2026 · Zone 6b

Pro tip: Sow Pumpkin directly outdoors 6 weeks before your last frost date.

🌿 Plant Details

Scientific Name Cucurbita maxima

Days to Maturity 100 days

Mature Height 12-24"

Spread 120"

Type Vine

Fruit Size Large (8-20 lbs)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1 inch/week)

↔️

Spacing

60" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 5-10 days

Ready to Plant Pumpkin in Pittsburgh?

Get your seeds now so they're ready by Wednesday, March 4, 2026.

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🤝 Good Companions

CornBeanMarigoldNasturtium

⚠️ Avoid Planting Near

Potato

🤝

Full Companion Planting Guide for Pumpkin

See which plants help Pumpkin thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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Common Pumpkin Varieties

Popular cultivars to look for at your local nursery or seed supplier.

Jack-o-Lantern

carving 100d

The classic Halloween pumpkin — large, round, and uniformly orange with thick walls.

Sugar Pie

cooking 100d

Small, dense-fleshed pumpkin bred specifically for sweet, flavorful pies.

Cinderella (Rouge Vif d'Etampes)

heirloom 110d

Stunning flat, deeply ribbed French heirloom in vivid orange-red; excellent for display and cooking.

Atlantic Giant

giant 130d

The competition giant — record-breaking fruits that have exceeded 2,600 pounds.

Jarrahdale

heirloom 100d

Australian heirloom with blue-grey skin and sweet orange flesh; very ornamental.

Common Pumpkin Problems

What to watch for — and how to fix it before it spreads.

🐛

Pests

Squash Vine Borer

Larvae tunnel into the main stem, causing sudden wilt; look for entry holes at the base with yellow frass.

Fix:

Wrap stem base in foil; plant after peak moth flight; inject Bt into the stem via a syringe for severe cases.

Squash Bug

Adults and nymphs suck plant sap causing leaves to wilt; inject toxic saliva that kills vines.

Fix:

Destroy bronze egg clusters on leaf undersides; handpick adults early in the morning; use kaolin clay.

Cucumber Beetle

Transmits bacterial wilt and cucumber mosaic virus; feeds on flowers and young fruit.

Fix:

Row covers until flowering; beneficial nematodes; pyrethrin sprays if severe.

🍂

Diseases

Powdery Mildew

White powdery coating on leaves; almost universal by late summer; reduces but rarely kills the plant.

Fix:

Plant resistant varieties; apply potassium bicarbonate or sulfur; ensure good airflow.

Phytophthora Crown Rot

Water-soaked lesions at the crown; plant collapses rapidly in saturated soil.

Fix:

Grow on a ridge or raised bed; avoid low-lying areas; improve drainage.

💡

Common Mistakes

Planting too early

Pumpkins are very frost-sensitive; cold soil stunts vines and seeds rot.

Fix:

Direct sow after last frost when soil is 65°F+; most varieties mature in 90–120 days so no rush.

Not hand-pollinating

Female flowers abort when pollinators are scarce, especially in rainy periods.

Fix:

Transfer pollen from male to female flower with a brush or use a male flower like a paintbrush.

Allowing pumpkins to sit on wet soil

Direct ground contact in wet conditions causes the skin to rot before harvest.

Fix:

Slip a piece of wood or a tile under developing pumpkins to keep them off the ground.

🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow fruit to fully mature and cure — ripe pumpkins have the most viable seeds.

Processing

Scoop seeds from mature pumpkin, rinse off stringy flesh, spread flat to dry for 2 weeks.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Pumpkins cross freely with squash of the same species. Hand-pollinate in the morning for pure seed.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 1 plant of Pumpkin. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Pumpkin in Pittsburgh, Pennsylvania? +

In Pittsburgh (Zone 6b), direct sow Pumpkin outdoors around Wednesday, March 4, 2026.

What is the last frost date for Pittsburgh, Pennsylvania? +

The average last spring frost date for Pittsburgh, Pennsylvania (ZIP 15213) is around Wednesday, April 15, 2026. This is based on NOAA climate normals for USDA Zone 6b.

How long does Pumpkin take to grow? +

Pumpkin typically matures in about 100 days from direct sowing. In Pittsburgh, that means you can expect harvest around Wednesday, March 4, 2026 plus 100 days.

Should I start Pumpkin indoors or direct sow in Pennsylvania? +

Pumpkin does best when direct sown outdoors. In Pittsburgh, sow directly around Wednesday, March 4, 2026.

📚 More Pumpkin Planting Guides

🗺️

Pumpkin in Pennsylvania

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6b Pumpkin Guide

All cities in your zone · Avg dates

→

Other Plants for Pittsburgh

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Growing Pumpkin in Zone 6b

Pumpkin (Cucurbita maxima) is a popular garden vegetable. In Pittsburgh, Pennsylvania, which is in USDA Hardiness Zone 6b, you should direct sow seeds around Wednesday, March 4, 2026.

Your average last frost date is Wednesday, April 15, 2026. Pumpkin grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.