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The best time to plant squash in Maryland is after the last frost date, once the soil has warmed to at least 60°F.
Maryland sits in USDA hardiness zones 5b through 8a, which means the ideal planting window runs from mid-May through early July for summer squash, and late May through June for winter squash.
If you plant too early, cold soil can stunt your squash seedlings and make them more vulnerable to rot and pests.
In this post, we’ll walk through exactly when to plant squash in Maryland, how to time it by region, and a few tricks to get a jumpstart on the season.
Let’s dig in.
When to Plant Squash in Maryland
Knowing when to plant squash in Maryland comes down to two things: your local frost dates and soil temperature.
Squash is a warm-season crop that hates the cold, so timing is everything.
Here’s how to nail the timing.
1. Wait Until After the Last Frost
The number one rule for when to plant squash in Maryland is to wait until all danger of frost has passed.
In most of Maryland, the last frost falls between late April and mid-May.
Planting squash before that risks losing your seedlings to a late cold snap.
Squash seeds won’t germinate in soil colder than 60°F, and seedlings can be damaged when temps dip below 50°F.
2. Check Your Local Zone
Maryland spans several growing zones, so when to plant squash in Maryland varies depending on where you live.
In southern Maryland and the Eastern Shore (zones 7b–8a), you can usually plant squash from mid-May onward.
In central Maryland, including Baltimore and Annapolis (zones 7a–7b), aim for late May.
In western Maryland and the mountains (zones 5b–6b), wait until early June to plant squash.
3. Warm the Soil First
Even after frost passes, cold soil can slow germination.
Before you plant squash in Maryland, check that the soil is at least 60°F a few inches down.
You can speed this up by covering beds with black plastic a couple weeks before planting.
This is one of the simplest ways to get the timing right when you plant squash in Maryland.
Summer Squash vs. Winter Squash Planting Times
When to plant squash in Maryland also depends on the type you’re growing.
Summer and winter squash have slightly different windows.
1. Summer Squash
Summer squash like zucchini and yellow crookneck can be planted from mid-May through early July.
These fast growers mature in about 50 days, so you can even succession plant every few weeks for a steady harvest.
If you’re wondering when to plant squash in Maryland for a continuous crop, stagger your plantings through June.
2. Winter Squash
Winter squash like butternut and acorn need a longer season, usually 80 to 100 days.
Plant winter squash in Maryland from late May through mid-June so they have time to mature before the first fall frost.
Planting too late means your squash may not ripen before cold weather arrives.
3. Starting Seeds Indoors
If you want a head start, you can start squash seeds indoors about three to four weeks before your transplant date.
Just don’t start them too early, because squash seedlings grow fast and don’t like being root-bound.
Harden them off before moving them outside when you plant squash in Maryland.
Tips for Planting Squash in Maryland
Once you know when to plant squash in Maryland, a few extra tips will help your crop thrive.
1. Pick a Sunny Spot
Squash loves full sun, so choose a spot that gets at least six to eight hours of direct light daily.
Good sunlight helps prevent powdery mildew, a common problem in Maryland’s humid summers.
2. Give Them Room to Spread
Vining squash need plenty of space, so plant them three to four feet apart in rows.
Bush varieties can be planted closer, about two feet apart.
Crowded plants are more prone to disease and pests.
3. Water Consistently
Squash needs about an inch of water per week, especially while flowering and fruiting.
Water at the base of the plant to keep the leaves dry and reduce mildew risk.
Mulching around your plants helps retain moisture and keeps the soil warm.
4. Watch for Pests
Squash bugs and vine borers are common in Maryland gardens.
Check the undersides of leaves regularly and remove eggs by hand when you spot them.
Row covers early in the season can also protect young plants.
5. Feed the Soil
Squash is a heavy feeder, so mix compost into your beds before planting.
A balanced fertilizer applied at planting gives your squash a strong start.
Healthy soil means healthier plants and a bigger harvest.
So, When to Plant Squash in Maryland?
When to plant squash in Maryland really comes down to waiting until after the last frost, when soil temps hit 60°F.
For most of the state, that means mid-May through early July for summer squash and late May through mid-June for winter squash.
Adjust based on your local zone, warm your soil, and give your plants plenty of sun and space.
Follow these guidelines and you’ll know exactly when to plant squash in Maryland for a healthy, productive garden.