Zone 4 · Root Vegetables Growing Guide

When to Plant Parsnip
in Zone 4

Slow to germinate, long to mature — but worth it. Frost turns starch to sugar; the sweetest parsnips are dug after a hard freeze. Needs deep, loose soil just like carrots.

Plant outdoors
Apr 15 – May 10
Start indoors
Direct sow
Last Frost
~May 1
Days to harvest
100–130 days
Difficulty
Medium
Plant now — Zone 4
Harvest window: Oct – Nov

Planting Calendar

In Zone 4, Parsnip should be planted outdoors Apr 15 – May 10, after the average last frost date of approximately May 1.

Good zone. Leave in ground through first frosts for peak sweetness.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
3–4 inches
Soil
Deep, loose, sandy loam — same as carrots
Days to maturity
100–130 days
Soil pH
6.0–7.0
plant tip · Zone 4

Good zone. Leave in ground through first frosts for peak sweetness.

Feeding Schedule

How often
once at planting
Feed type
low nitrogen (5-10-10)
Key timing
before sowing

Like carrots, avoid excess nitrogen. Prepare the bed with a low-nitrogen fertilizer before sowing for best root development.

Companion Planting for Parsnip

What you plant next to parsnip makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Lettuce
  • Peas
  • Radishes
Keep away from
  • Carrots
  • Fennel

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Common questions

In Zone 4, direct sow parsnip outdoors Apr 15 – May 10 after your last frost date of approximately May 1. Good zone. Leave in ground through first frosts for peak sweetness.
Zone 4 has an average last spring frost of approximately May 1 and a first fall frost around Oct 1. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for parsnip include Lettuce, Peas, Radishes. Avoid planting near Carrots, Fennel, which can compete for nutrients or attract pests.
Parsnip typically takes 100–130 days from transplant or direct sow to harvest in Zone 4. Expected harvest window: Oct – Nov.

Free app · iOS February 2028

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Parsnip in other zones
Crop Guides