Django: How to set DateField to only accept Today & Future dates

You could add a clean() method in your form to ensure that the date is not in the past.

import datetime

class MyForm(forms.Form):
    date = forms.DateField(...)

    def clean_date(self):
        date = self.cleaned_data['date']
        if date < datetime.date.today():
            raise forms.ValidationError("The date cannot be in the past!")
        return date

See http://docs.djangoproject.com/en/dev/ref/forms/validation/#cleaning-a-specific-field-attribute

Another useful solution is to tie validation to fields using the validators keyword argument. This is a handy way of keeping your Form code clear and enabling reuse of validation logic. For e.g

def present_or_future_date(value):
    if value < datetime.date.today():
        raise forms.ValidationError("The date cannot be in the past!")
    return value

class MyForm(forms.Form):
    date = forms.DateField(...
                           validators=[present_or_future_date])